I agree that Oracle has been a perfectly fine trademark holder in all of these regards in that they are entirely irrelevant to JavaScript and have been for as long as I can remember.

The point here is that them not doing those things would be codified. Deno's not trying to take the trademark from them for themselves, they're trying to get the USPTO to agree that JavaScript is a generic term at this point and unable to be trademarked or owned by any one entity.

I'm not sure how that changes any of the bullet points you've got above. It's nice that points 4 and 5 would become completely impossible and not just improbable because the trademark owner currently doesn't care enough to do it.