I guess Moshiri has got the stadium started, which is the hard part, so the club is a more sellable prospect now.
He'd be in a stronger position if all the investment had us in CL places, but here we are. That weaker position is probable why some parties are interested.
If he can get his money back now and more, assuming he hasn't enjoyed the experience (you'd expect), it would seem obvious to sell - especially if Usmanovs ban has changed everything.
Moshiri is obviously smart enough to keep a poker face and pretend to stay.
This hasn't come out of the blue - there were stories during the relegation battle that parties were interested depending on whether we stayed up, so I guess this is that.
Good for Everton ? Depends on the buyers intentions of course.