I would say it depends, from your examples:

1) borderline. Potentially provides some benefit to the thread for readers who also don't have time or expertise to read an 83 page paper. Although it would require someone to acknowledge and agree that the summary is sound.

2) Acceptable. Dude got grok to make some cool visuals that otherwise wouldn't exist. I don't see what the issue is with something like this.

3) borderline. Same as 1 mostly.

The more I think about this, the less bothered I am by it. If the problem were someone jumping into a conversation they know nothing about, and giving an opinion that is actually just the output of an LLM, I'd agree. But all the examples you provided are transformative in some way. Either summarizing and simplifying a long article or paper, or creating art.