It looks to me like there will still be an option to get a code sent via email, not requiring an account link to Google or Apple.
I hate always having to go check my email or SMS for a login code, but it’s not like I expect Trakt to reverse this change. Best we can hope for is an actual notification to users via email, website/app banners, EVERYWHERE! that the sign-in flow WILL change with a link to the announcement thread (New Sign-In Flow)
Would I rather see 2FA and passkey support added here instead? Absolutely. But Trakt has recently shown no inclination to hear and respond to actual feedback, so I will not expect it.