#1) They own CBS, which has been looking to bump up it's sports offerings in the last year or so (including scheduling Premier League in daytime recently instead of the usual soaps and newscasts) and pretty much buying up rights to every single B and C tier league that doesn't have a TV deal elsewhere. CBS would absolutely shelve a couple of it's 47 cop shows in primetime for a chance to net AEW's demos and still likely lateral their viewer count.

#2) They own like 30 cable channels including MTV, Paramount Network (the former Spike), and like 30 other niche channels that AEW could expand it's content types towards microtargeted audiences.