http3 operates on a different OSI layer

Yes, which the article claims is just a theory now, irrelevant for the real world. More crucially though, http3 doesn't use TCP because it is built on top of UDP.

	▲	magicalhippo 4 hours ago \| parent [-]
		It's like how people say "pass me the butter" despite there's just a tub of margarine on the table.