That was a comment written in a particular context, where the original commenter was concerned with large PRs.
>> how can we review gigantic PR generated by AI.
It was not a comment written in a vacuum saying that all PRs should be small (or not large, whatever that means). Though grey-area does provide some reasonable commentary for why it's good to shrink them (easier to roll back, easier to isolate bugs, etc.). Maybe grey-area does mean to ban all large PRs, but that's not evident in this thread where they wrote a response to a specific comment offering their take on how to resolve the problem raised in that first comment.
> You're loosing big swing aggressive efforts to make sweeping progress.
Just a tip: "losing" not "loosing". We loose arrows at our enemies, we let loose the dogs of war, we loosen our purse strings. But we do not "loose big swing aggressive efforts", we "lose big swing aggressive efforts". It's funny that you get it right once, but mix the two up in the very next sentence.