False.
i just went to the tiktok website with adblock turned off and clicked "continue as guest" when the popup appeared to sign in.
there's even a userscript to do it automatically so you never have to see it.
and a firefox extension
TikNot - Watch without logging in! – Get this Extension for 🦊 Firefox (en-US)
Download TikNot - Watch without logging in! for Firefox. Watch TikTok videos without logging in!
addons.mozilla.org