Are you talking about low-lead brass? Yes, it still has some lead. I don't think the "hot water" labeling is relevant? Unless some states allow non-low-lead-brass in hot water lines?

Alternatives are skipping the brass fittings/nipples and using copper, stainless, or the various plastics. I'm guessing you're seeing the stuff about water heaters because you shouldn't connect copper directly to water heaters (they have steel tanks which with copper creates a battery and corrodes the connection quickly).

And HD doesn't really stock stainless as far as I've seen, though you can certainly get it online. Not sure how it fits into plumbing code for potable water though.

re: the parking lots, in my experience HD is more popular with tradespeople. the goal of the raids isn't really immigration reform, but rather general fear - including for legal immigrants just trying to go about their business.