Rick, there was a similar discussion in another thread - - this seems like a weird loophole, but I think you are correct. ADAS and the code only seem to address 2 of the 3 dimensions for T.P. dispensers: vertical height above finish floor, and horizontal distance in front of the bowl rim. It does not address the side-to-side distance from the centerline of the toilet; probably most everyone assumes you intend to mount it on the closest side wall.
However, ADAS 604.3.2 allows dispensers and many other components to "overlap" the required maneuvering clearance around the accessible toilet:
604.3.2 Overlap. The required clearance around the water closet shall be permitted to overlap the water closet, associated grab bars, dispensers, sanitary napkin disposal units, coat hooks, shelves, accessible routes, clear floor space and clearances required at other fixtures, and the turning space.
No other fixtures or obstructions shall be located within the required water closet clearance.
In theory, you could have a T.P. floor stand centered 7" directly in front of the rim, making transfer from a wheelchair impossible, and yet it would still comply with the letter-of-the-law.
Furthermore, ADAS 604.3.2 doesn't limit the purpose of the "dispenser". Again, in theory, it could be a soda vending machine, dispensing cans of coke: it's a "dispenser", allowed to encroach.
Lastly, I don't think there is anything in the building or plumbing codes that compel either the toilet paper or the toilet paper dispenser to be provided at all! Bring your own corn husk.