It was totally a warning. How many times have you seen people say such things about rookies coming into the NBA? Or the NFL? When Victor Wembanyama came into the Spurs, did you hear people on the Spurs talking about how he had to watch out, and how the NBA was totally different? All I recall were people talking about how he was a unique talent who could impact the game at the next level (and even if they commented on his need for growth, it was never a veiled warning). Clark could be that kind of player for the WNBA, but instead of discussing that, it's nothing but the pettiness of group rejection from everyone around her.
I hate playing into the steretypes, I really do, but there is a jealously and frustration behind a lot of thing that's unmistakable. And the word for it all is cattiness.