Genuinely think that, for her, a way to do updates through videos might be easier for her than writing a post lmao. But yes, like others have said, she's barely even active on her mains so I don't get the purpose of a 2nd page for "updates". But if anything, I'd vote Free OF page since it can be risky posting about certain OF related updates on Instagram
Using a second account so her main is risk free of getting banned. Instagram can be a bit weird in terms of bans when you post about lewd stuff or advertise stuff like onlyfans accounts. So making a new account where you post announcements and updates for OF seems like a valid idea. Aswell as uploading teasing pictures for new picture sets/videos.
She already said in a Q&A on her 2nd IG last year that she was going to use it for NSFW related stuff and keep her main account for SFW. I agree that this would be best.
Sounds like that Fansly vid, where it had a very brief topless scene that someone screenshot. Right after that, she took down her Fansly, saying it was hacked, then started disappearing from OF. This all happened in June last year. Strangely, it was only a month later that she brought up the topless content question.