That is true. What recently happened is that the Supreme court has determined that speech which benefits a foreign terrorist organization constitutes "material support" to that organization, and providing material support to a terrorist organization is a crime which can get a green card revoked.

Now, I don't think it makes any sense that speech is "material" support, but I also think it doesn't make any sense that speech is "violence," and US culture seems to have repudiated my thoughts on what distinguishes speech from action.

But whatever I think, under current law, speech in support of a terrorist organization is no longer free speech. And certain pro-Palestinian organizations were defined by the previous administration to be terrorist organizations back in November. So it follows that certain pro-Gaza activism is no longer free speech. I don't think this should be the case, but this is the current state of the law.