Thought I'd get real answers, but yeah, it's just more of the same spin.

I get what you're saying about following the label, but you can't blame the can for what the grout bag itself said. That 7 day cure time is right there in black and white, and it's not like it's hidden in fine print. We all rush jobs sometimes, but your tile guy told you the real rule, so now you know for next time.

Makes me wonder why we pay double for anything with a brand sticker on it.