Still can't sign out of netflix - what am i missing?

Fastest way to kick everyone off at once is changing the password in the account page - it offers to sign out all devices with the new password, tick it. That one does catch the TVs.

the tv apps all bury it somewhere different and a few of the older ones dropped the option completely, so you're not imagining it. easier route is to ignore the tv entirely. sign in on a browser, go to your account page, and there's a section for managing access and devices — you can sign out one device from there or all of them at once. it isn't instant on every tv though, mine stayed logged in for a good while before it noticed.