You both are off here. This particular int was on Mahomes not Skyy.
This was obviously an RPO and Mahomes changed Skyy's route to beat the man coverage (cover 1 man defense). Rice ran the rub to free Skyy since with the RPO call he needs to get it out quickly.
Once the defender doesn't bite on the rub and plays the deeper route Mahomes needs to hit Skyy on the back shoulder throw early as the defender wouldn't be able to get there. That is the post snap adjustment. Skyy slows his route because he can see the defender didn't bite amd you can see him start to turn for the back shoulder throw. Mahomes should have hit him then. People are misinterpreting Skyy's route as a double move but it's not.
Instead he throws the pre snap adjustment route, ignoring that the defender didn't bite on the rub.
Mahomes even said as much in his press conference that he should have thrown the back shoulder on Skyy.
This play actually shows Skyy is starting to make better post snap route adjustments, which is what we've all been crying about. Mahomes just missed it.