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@DFP
no, *your *fattest.
(as a certain television comedian likes to say.
And yup, go mtb.
Theres heaps of off the peg city bikes around at the moment bassed around mtb's
Or you can pick up a good quality second hand XC bike for peanuts and upgrade a few off the parts.
I would avoid suspension, a well made rigid frame with a high top tube and long head tube is what your after along with a solid wheelset. Ideally at 36H, dont bother with disc brakes, waste of time/money in the city. - If he really is that heavy, it would create immense loads from hub braking, and require very regular truing.
A small frame would flex a lot more, and the seatpost would be a heavily weighted preacarious cantilever so best avoided.
Stick on some quality city tyres, not full slicks, run at 65psi+
A high well positioned seat with for good riding posture will be important.
As sitting straight up, with all the weight on a low saddle will give him a numb arse. Also create a lot of fatigue on the rear wheel.
Getting the body up and foward is a good idea, creating a better blanced weight and takes seat pressure to the tougher parts of his bottom.