Being fingerprinted across Tor is different from being deanonymized—it basically just "psuedonomizes" you. You now have an identifier. It is a significant threat, but it is not hard to "psuedonomize" someone based on stylometry and some of the people with the highest threat model—operating an illegal site, will be pseudonymous anyway.

Don't get your opsec advice from HN. Check whonix, qubes, grapheneos, kicksecure forums/wikis. Nihilist opsec, Privacyguides.