It looks like the specific phrase form is blocked in Google Search's AI header. It seems most likely that this was because it was being gamed. Searching "is it safe to throw used car batteries into the ocean" gets links to the meme.

All the ML tools seem to clearly say it's not safe, nor ethical - if you ask about throwing batteries in the sea then Google Search's summary is what you'd expect, completely inline with other tools.

If a large swathe of people choose to promote a position that is errant, 'for the memes' or whatever reason, then you're going to break tools that rely on broad agreement of many sources.

It seems like Google did the right thing here - but it also looks like a manual fix/intervention. Do Google still claim not to do that? Is there a watchdog routine that finds these 'attacks' and mitigates the effects?