The existence of them, yeah. I don't think it's so clear cut that it'd be a net increase in harm. Advertising I'm not so sure about, but as for the mere existence of them:
Group A is going to smoke regardless, having a healthier product reduces harm
Group B is never going to smoke no matter what's on offer
Absolutely no cigarettes should be marketed to children. That doesn't mean various cigarette-adjacent products cannot exist.
You’re missing Group C, who didn’t offer cigarettes to their kids until their kids heard of these “healthy” cigarettes that are “safe for kids”