Alright, I'll try to tackle this in the proper order. I said that "visually" Galio was the generic gargoyle ripped from the 90's cartoon. Compare what you typically associate what a gargoyle would look like, and you had a pretty strong idea of what Galio was. I was defending the new direction they took with his new visuals because now he's more tied to Demacia, and he blends in with the architecture/aesthetic of the city-state. Even so far that he's made of the anti-magic marble called Petricite (from what Riot Reav3 has said) which is what all of Demacia is constructed of.
It isn't justified to bring his lore into this because all we have access to at the moment is a brief summary of what he his. So far from what we know; He's still a construct of Durand, he was designed to awaken and protect Demacia from magical attacks, and he's colossal in size. There is a bit of a departure from his current lore, but that tends to happen with all Champ Reworks. No longer is he being melancholic about failing to protect his creator. Galio now tries to enjoy every moment he has of life when awakened by magic, but is in a constant state of questioning his existence. Knowing that once he extinguishes the magical threat that gives him life, he will fall asleep for decades. The world he knows will change drastically in that time, and only ever be awakened to quench another magical threat.
I don't see how you could try to make the pseudo-comparison to Poppy being turned into Elise. It's also the old lore that Poppy was carrying a crown, and Poppy's new lore is her finding the hero of the hammer.
His current ult having some counterplay in the necessity of needing to buy items/summoner spell as the only escape isn't very dynamic, and entirely binary. Now I understand that simple is good in a few cases, but the taunt on his W now, the grows in radius the longer you hold it, is very rewarding to get off. Live Galio would need to Flash+Ult, which are to very big abilities to put on CD for the enemy team to just QSS or Cleanse out of. With the rework, if you manage to E into the enemy team, smack a player, and quick release W for your team to make a play. It feels very very rewarding as long as your team was there to follow up. True his big burst of damage is gone the was tied into the ult, but that power was dispersed throughout his new kit.
To be frank, Trynd, Kayle, and Amumu are all tier 1 & 2 candidates for a future rework, so I wouldn't use them as examples. Big reason why Tanks are the next roster update is because the feel that all tanks currently are just a tweaked version of Amumu. Q is the gap closer CC, W is ambient AoE damage, E is another AoE/Close range burst damage, and Ult is massive stun/knockup/displacement AoE. What I just listed fits Amumu, Sejuani, Malphite, Nautilus, and if you swap the Q,W,E around it's Maokai and Zac (Maokai's ult being the exception.)
What Riot deemed was core to Galio may differ from yours and I can understand that you'd feel upset. I love Galio as a champion. Like I said previously I played the hell out of him. Mid, Support, and occasionally Top. He's great, but I always noticed his kit felt it was lacking something. In my previous response I mentioned all the things his new kit makes up for that his current one can't help. His clear, his sustain, engage, etc. I feel they've all been improved. I was in every way explaining how they maintained his core, not just exclaiming I love his new kit. His health gain on W from taking magic damage didn't cross over, but Riot has slowly weened any form of Spell vamp out of the game bit by bit, depending on the champion. You could totally slap Galio with some Grievious Wounds if you could get to him. Otherwise the W wasn't effected by the heal debuff while Galio is tanking the inhib turret, healing for most of the damage taken, his team is pushing past it to assault the enemy team, allowing Galio and the ADC to take the objectives. I've had that experience in most if not all of my Galio games.
Onto the last bits that we're just pretty much tangents.. Yes Kass is an Anti-mage, but slapping his kit on Galio wouldn't do a thing for his identity as the Anti-mage "TANK." I don't even know how to comprehend your rebuttal for ask if Taliyah/Kled are Galio because they're fun to play. It doesn't even make sense why you'd say that, unless it's just to troll me.