Yes that can be the reason or even I think he can make some changes in the AI post which make that post totally human made.
It is possible, some say that there are tools that somehow
"humanize" AI-generated content, but even minor manual changes in such generated text can confuse AI detectors and show that the text was written by a human.
By the way he always doing this one time or two times can be tolerated but continuously doing this is not a good thing I think so. Isn't it?
I do not think that this is a natural way of using the forum, in any case, for me personally, it is not something that I consider positive. I always start from the assumption that we are not all the same and that we do not live in the same conditions, so if someone does not have access to a computer and the internet every day, I can understand that they write more posts in one day than others, especially if they participate in sig campaigns.
In any case, the members should be warned and given a chance to explain why they are doing it and the possibility to try to change it.