Technically saying, yes they are, but they are pure blooded muggles not pure blooded wizards

Yup, I’m one of the people who think the current blood labeling system is inaccurate. Like I believe you were saying, if a magical child has four magical grandparents, but their two parents are squibs, in my mind they should be halfbood, or maybe a unique title, but according to HP fandom they’re muggleborn.

Then for me another status I don’t agree with is if a muggle and a magical person have a child and that child isn’t magical they are probably just a muggle like their non magical parent, but again according to HP fandom any non magical person born to at least one magical person is a squib. To me a squib makes more sense if they came from two magical parents and likely more magical ancestors up the family tree but they themselves have no magic. A non magical child who has one muggle parent to be just sounds like another muggle, not a squib.

I agree that the labeling system is confusing and inaccurate. Those that have a non-magical great-grandparent or maybe even ancestors should be considered half-blood, but because it is only for grandparents, they are considered pure-blood. In my mind, the term half-blood should only be for the child of a wizard and a Muggle or a Muggle-born parent, but it is also for a pure-blood and a half-blood, two half-bloods and etc.