Also, you assume they’ve actually increased the number to keep the mass valid

I would assume so, and with good reason. The laws for that stuff are strictly enforced. There’s a margin of error, but we’re talking a few grams. Enough that one fewer tortillas in the package would put it over that limit and litigation would ensue.

Once they run out of old packaging

Packaging is cheap af. They’re not trying to run out their old packaging. I’m not saying that it’s not a lead-up to shrinkflation, just that they don’t care about old, leftover packaging. More likely, IME working in packaging, would be that they’re waiting for someone working on the machines to dial in the settings before switching to a different roll of film.

Anyway, I wasn’t trying to argue anything in the first place, just trying to get a grasp of OP’s point since they didn’t really explain what the issue was.