I think I know what's going on here
Years ago WWE made a documentary about Nigel for the Network that included footage of his ROH matches against Rollins, Bryan and Claudio
And since the Timelines video was in the AEW youtube channel and not the ROH channel, and since AEW and ROH are technically two different companies, WWE decided to take advantage of it and strike them with a copyright claim
https://www.youtube.com/watch?v=R8ew8nVs6PY