Here's the article he was referring to:
https://n.rivals.com/news/stock-report-five-rivals100-prospects-whose-stock-is-falling
Also, the tweet above is from April, the dicussion above was from other camps and observations this summer.
You also have to look at his rating on the other services. He's 298 on 247s ranking and is not in the ESPN 300. His current composite score is 200, but that will go down slightly once the new Rivals rating is reflected (still based on his 52).
All that being said -- it doesn't matter. I'm a Purdue fan and we went through (and still complain) about Rondale's rating (he was a 3* on Rivals!) All that matters is what he does for you when he gets there.