If you watch a game in korea you would also notice that the chat is livid, mid laners are going afk if they do not receive a blue buff post 7 minutes. Koreans toxicity sways the game more than in game factors themselves.
Koreans have a problem with actually even playing in soloq because of how bad it is. If you refer to cowsep's forum on it, he had a problem with someone on his team being racist or just trolling every other game. He's in diamond in Korea, he can't even play a game without being trolled or have a mid laner of his go afk.
A gold game is way more likely to be over at 15 than a diamond game because the immediate response that is widely accepted is to just be toxic. Not try to come up with a plan or a teamfight, push, objective contestion, or even a stall for time. People would rather ff and flame than actually figure out what they're doing wrong.
Once I figured out what I was doing wrong I finally got out of gold and that's what other people should start realizing themselves. It's not in game factors that just make a match up unplayable, it's the inability of a team to come together and actually figure out how to win.
All of the things he's listing have been almost in the same state for the past two years for gold elo besides game time, game time has been drastically decreasing for two reasons. The ff at 15 ability and people's toxicity/quickness to give up.