I've seen the media stories. The coach and his lawyer are claiming that the consensual affair with another coach was the reason for the suspension. SafeSport has not completed its investigation and there is no comment from that side. SafeSport really does not have the capacity to conduct thorough investigations quickly, so there's no telling how long it will take for this to reach any resolution. A consensual relationship between two coaches of equal standing would not, by my read, violate the SafeSport code. If, however, it were something like a state chair and a junior coach, it might. But I know nothing of the particulars in this case other than what has been reported.
The line of "consensual" is a murky one when it comes to boss/employee relationships. A sexual relationship that invovled a misuse of a power imbalance could violate Safesport, under certain circumstances.
Yes, the owner/coach has said it doesn't relate to anyone involved at his gym. I'm assuming someone would have reported this incident and it seems to be beyond the bounds of credibility that a 13 year old consensual affair would have been reported or a suspension would have resulted from a report.