Likely he means expressing any pro-Palestine sentiments. Doxxing is very common and if Ivy League deans were taken down, immigrants are likely to be deported for expressing any empathy towards the Palestinian.

Yes that is a very legitimate fear.

But the people doing the doxxing complain that any criticism of Ire* for their war crimes makes them feel like there is no place they are safe, I don't buy it but the complainants have a lot of allies.