https://github.com/Gethe/wow-ui-source/blob/f0084386950fe3dc31a1d61de33b364e268cf66b/Interface/SharedXML/HelpTip.lua#L145

If this is intended to be a bug report, please describe the issue.

Just noticed it wasn't in the cvar browser.

It seems to be either Blizzard forgot to register it as an actual cvar or they intended it to be used via C_CVar.RegisterCVar("hideHelptips", 1). Anyway thanks for the tip, it will be a good addition to HideTutorial 👍

Yeah, also looks like it doesn't get saved if you exit the game, but will persist though logouts.