yes you are right, there are many fake live streams that use video recordings of interviews from the past on youtube. the problem with the live streaming is that it comes from a hacked youtube channel. a lot of youtubers from my country experienced this, their channel was hacked and renamed, then used it for live streaming.
Hacked accounts is one, but there also have been a lot of 'fake' livestreams whereas the scammer just creates a fake Twitch/YouTube account and plays an old stream recording (with some huge text plastered on the video like "free airdrop or something), and just adds a scam link on the description.