This doesn't fit any definition of the word "slop". Slop in the cultural sense is low quality content that is low quality and meaningless. Slop in the literal sense means food that you feed to pigs or live stock. Slop in the sidebar definition says "anonymous" "bullshit"; Anonymous means that you don't know who it is; bullshit means low impact, meaningless, empty.
It seems disrespectful to the people impacted to call it "slop". You wrote in the title that it's an official government action. There have been people already deported for criticizing Israel. There will be more people who are going to be deported for criticizing Israel. If you spoke to them and they told you about their deportation, would you say to them that it's slop?