Morning rasman - only the Ed can answer that, I believe. When the new powers came in, Ed explained to us all that mods can suspend - and Ed has the power to reverse that - or ban if something is extremely offensive. IMO Mods can't modify content of posts, only Ed can pull posts - and he's not likely to offer explanations about his actions, he's said before that "Ed's decision is final".
I didn't see it so I can't comment, but I can only assume from what you say that it wasn't the content of the post but the OP himself which was a problem - perhaps he was a previously banned user under another name. Banned people have often tried to come back with sensible questions or made some people laugh - but Ed does rumble them in the end. It's either that or something in the content of the post.
If it wasn't fair, then sprayermick will be back.