Yes. In the app you can sign in with email and password, with Google, or with Apple. In My account on this site you can sign in with email and password or with Google.
Always use the same method you created your account with. If you created it with Google and try to sign in with email and password, you'll see a notice saying the account was created with Google; in that case, tap the Google button.
If you used "Hide My Email" when signing in with Apple, Apple shares a forwarding address with us instead of your real email. Keep this in mind if you bought Premium on the web with a different email: in that case, write to us at [email protected] so we can link your purchase.