If it's inappropriate for him to have a "position," he should not be saying things like claiming "Roblox is a problem"

No, it’s not.

Just because proposing a solution would be helpful, that doesn’t require he propose a solution.

Related, sometimes articulating a question in the right way is the hard part.

Indeed, it's editorializing.

But more broadly, all journalism is necessarily axiologically loaded. Why report on X but not on Y? Obviously, because the journalist/editor/owner thinks X is "newsworthy" while Y isn't.

Whether that means proposing a solution is another question. I can sympathize with annoyance at nonconstructive complaining, however.

Whatever the technical/legal solution, I think an important factor is also parental involvement. If Roblox is dangerous enough, don't let your kids use it. They might get around your ban, but at least you did your part. That means a great deal already. And people circumvent and break the law all the time, but that doesn't invalidate the law, and parents are lawgivers.