I would agree with you that DWThomas correctly describes 'angle of view' as a product of film size and pinhole-to-film distance.
I think it's misleading and confusing to also call the restriction of the light path by the thickness of the pinhole material the 'angle of view'. Why use the same term for two entirely different effects? In my view the effect of the pinhole material thickness would much more accurately be described as 'angle of coverage' if we're choosing terms analogous to lenses.
Yes, I agree with that. That's more consistent. I will change my notes accordingly.