I should say that the tangent off into linguistics was somewhat “wait, what?” for me as well, but I think people have pretty much covered it, so instead I’m going to touch on a part in the 4th moment section on page 31:

“These should be called enabling acts. … With an enabling act, the machine grants something to the operator…Thus receipt of any of the aforementioned items–power-ups, goals, the HUD (excluding input elements), and health packs–all constitute enabling acts.”

This would all be fine if it were just in the area about the machine; after all, as Galloway says, the operator’s involvement in getting these things can be thought of (perhaps artificially, but at least reasonably) as being distinct from their actually receiving them. Why, however, is this necessarily nondiegetic? In Xenogears, for example, there is a part where one of the main characters is given a sword from another character after having put aside weapons for many years. It is a pretty diegetic moment unto itself (I don’t want to spoil the details of why), but it has distinct nondiegetic implications: this character suddenly does something like 20-30% more damage than he did just beforehand. In general it seems like situations like these can easily come up.

I think I may perhaps be forgetting about something from earlier in the chapter about these sorts of things blurring together and how Galloway separates them, however.