I think profits on real estate sales aren't included in PSR profits / losses for the simple reason that infrastructure costs when they are built and depreciated aren't considered costs. So it doesn't matter who they sell too and for how much.
Edit: Apparently, I was wrong. The profits are excluded from EFL PSR, but it's allowed as profit under PL PSR. How fucking stupid is that? Add it to the list of "The PL doesn't know what it's doing!". So you can lose as much money as you want, as long as you strip the club of its assets to compensate. Sustainability my arse.
So I suppose the only issue is fair value (and this profit is the only reason they didn't fail PSR. Remarkable).