dude.. why did you even dare to try having someone put in something as crucial as a clutch when it was nothing like the old one, off by an INCH is serious.
and why this mechanic didnt stop and say "hold up, this isnt the right clutch." is beyond me.
also, if there was no fluid in the tranny, you would have noticed. there would have been puddles for days before it went dry, it would grind nearly every gear, make all sorts of noise and smoke.. plus you dont "open" the trans for that..
and again, even IF the tranny was completely seized, the clutch, assuming its the right one, which i dont think in your case it is, would still operate hydraulically independant of the tranny gears, and the engine would still turn over nice and strong.
this guy either made some serious mistake and doesnt want you to know about it (hope he's not related) or that clutch is totally not for your engine/tranny and the mech had no business even putting it in there.