The 210s I've flown (73 and 86) had electro-hydraulic pumps--an electric motor turns the pump. But the gear is abominably slow to cycle, so you sure don't wait until the very last second to put it down, like you might in a Mooney or a Bonanza. Especially the earlier ones with gear doors, the cycling of the gear is delayed until the gear doors can open, and they also open slowly. Then the main gear slowly goes down and forward, then the doors slowly close again, and finally the green light comes on. On the newer ones without gear doors, the light comes on when the nose gear locks--the mains lock first with a noticeable clunk.
I guess if I'd been in his situation, I'd have put the gear down. Sliding on the belly really limits any ability to steer on the ground, especially once the airplane gets below about 40 knots when the rudder loses effectiveness.
On the other hand, any landing you can walk away from is good. This one will take a bit of buffing out to make it flyable again, though.
Cary