It's from the same story arc (written by present-day Claremont - which somewhat explains inconsistency with past works) and doesn't really show either way. Rachel was reluctant to interfere with the King. No one was acting like themselves. 😬
In previous stories I'm pretty sure Brian has been affected by telepathy. I know for fact that 616 Psylocke's telepathy has worked on him when she was sparring with him and using it to anticipate his moves. This may or may not constitute a retcon.
Originally posted by Mr. Slippyfist
Those scans didnt illustrate an immuity to TP at all. As Rachel said, he reacted before she could get a hold of him. Thats all.
Rachel also shows in her scan her reluctancy to attack the King anyway because of who he is.
So for all we know her reluctancy could've have had something to do with how Brian was able to escape her TP attack.