If this is true, it will have a significant impact on people doing X.

Because this is no longer just a simple adjustment of recommendation weights. X already open-sourced its new recommendation algorithm in January this year, and both the official documentation and code repository are very straightforward: the For You feed is now based on a transformer architecture that shares the same source as Grok, and the repository explicitly mentions the Phoenix component. In other words, Grok is taking a deeper role in managing recommendations, not just a rumor.
But the statement in the diagram that says “Full takeover next week,” I haven't seen official confirmation from X’s official blog or product announcements yet; more of it is secondhand information, so for now, treat it as a trend, not a confirmed fact.
For ordinary creators, the one thing to remember is: it will be harder to fool the algorithm in the future.
Spam posts, forced engagement, mechanical interactions may become less effective.
Whether the content can make people stop, keep watching, and be willing to interact will become even more critical.
If Grok truly takes over recommendations, the platform is likely to become more like a content-reading judge, not just a data-guard.