The critical part of your post is, “as far as we know”. And having seen how honest trump is in dealing with everyone else, what makes you think he’s telling the truth about any part of his taxes?
Further, America has political norms: Incoming presidents don’t send their predecessors straight into the arms of the police (“lock her up”) and they definitely don’t regularly demean the Federal Government, it’s workers, or the policies thereof; they also don’t demean regular Americans or anyone if they can help it. trump has trod upon those norms and then laughed about it because, you know, he’s so much smarter and better and greater than anyone else that he transcends tradition and makes it anew in his image. /s
It’s not the lawbreaking we’re focused on with trump’s taxes, it’s the political norms that, at least in part, shape the gov’t as a whole and allow the US to function, politically and socially.