Almost no characters in league hs a clear sexuallity, but Riot chooses one of the few, probably the only confirmed straight character, to retcon and make gay. It's painfully obvious it's a cheap attention grab.
Like Riot said, they have very few lore based cinematics, and this cinematic along with the Xayah and Rakan cinematic, are the only ones that show an actual relationship, albeit Xayah and Rakan's relationship didn't play too big of a role, they could have just been some fighting buddies, they put minimal effort in the cinematic to show their afdection for each other, whereas the Varus one it was all "No please don't seperate us" Sob sob.
The idiots can go and say "But muh representation" or "But mah pretty pretty cinematic", but the people that see every opportunity to validate their existance to others are idiotic beyond comprehension.
Finally, can you imagine how a high quality animation with Varus's old lore would be? Seeing an elite soldier having to leave his family because of his loyalty, just to find his family slaughtered after he kicked so much ass, and turning to corrupt himself with the Darkin weapon he swore to protect to get revenge on the people that played a part in the murder of his family. Hell they could have even snuck in Singed, Swain, and Darius. That with so much moral abiguity would have been truly epic and lore based, but no, we get this cheap excuse to basically "Insert surprise LGBTQ character here"-Never seen that one before...
Really though. This was cheap and disgusting. Make a new gay champ? Fine, that's completely fine, but, completely change the lore for one of the oldest and arguably the coolest lore-wise? That's sick.