If someone else tried to do the same thing again with a more popular/widely-used software, a) the software would just get pulled as a supply-chain risk and b) the developer would likely be blacklisted. Again, accomplishing nothing.
What I would support anyhow is less destructive "attacks" using prompts more likely to work (modern LLMs still are a bit stupid, prompt injection doesn't seem to have been solved).
Less destructive anyhow is e.g. convincing the LLM to stop, or to make junk commits, or to go in a loop for a little, anything inconvenient enough to make the LLM and its user give up without causing losses (or at least losses unrelated to the project, since you were told to not use LLMs on the project).
Performative for which side you mean? The author described it in the context of them expressing their opinion, thus imo the performative part describes all these extreme, unwarranted reactions and canceling against them.
Oh no the people I don’t want using my software aren’t going to use it. The horror.