Not sure why this is controversial, the MCU's main universe is a cinematic adaptation of 616. The only "proof" of it being earth-199999 is a coffee table handbook from 2008, when the first and only MCU movie came out. It's not just an in-movie easter egg, In red carpet interviews for Doctor Strange 2 the actors and Kevin Feige refer to the MCU as earth-616. I feel the wiki should represent this. Side note would be to say that agent's of shield is a branch timeline/universe but that feels less important.