Considering the fact the convential airframe F-22 is not very good at air-combat comparing with the ground-breaking unique airframe of J-20 (lifting-body co-plane canards blending with leading edges), when a F-22 is facing a J-20, the result may not much different than trying to pitting a SU-27 against a J-10.
And since according to USAF’s internal military excerise, you get something like 1:144 when trying to pitting F-15s against F-22, let along the dog-fight/air-combat monster J-20, I would expect it would be quite a bit one-sided when we trying to using F-15s against J-20.
I had not even seen this piece of cr@p. Goodness, you are saying that the F-22 is 'not very good at air-combat' compared to the 'ground-breaking' J-20! Do you know how astoundingly stupid that is? Even for one as you?