Always take what you hear in a YouTube’s videos with a grain of salt.
They are generally no more informed than we are, and get their information from Waypoint, like we can. And it’s not uncommon for them to miss a minor detail, that changes their perception around a given topic. They are just human after all.
The best place to get accurate info is from the developers themselves, via Waypoint updates and anything that comes from the horses mouth.
I watch a fair few Halo YouTubers, but if I see they are covering a waypoint update, I’ll go read it first to ingest the facts a face value, then go checkout their opinions on said update.
I've heard some claim or allude to being 'in the know', as in they have inside information like they know someone inside 343 who is feeding them info. I usually call bullcrap on that unless it turns out to be true in the end consistently. I feel some do that just to seem more 'credible' to their followers and so that on the off chance they are
right, their followers will share that with others and it'll result in more subscribes for them.
Though I'm not sure which ones do this, the only content creators I follow are HiddenXperia, HaloCompletionist, DetroitOddballs, Mint Blitz, GeneralHeed/Kidd, and I think I'm still subscribed to Halo Follower from a long time ago. Not all of those creators talk about the new up and coming stuff, some of them just idly mention it while streaming.