This is not with the public method posted here which is already patched.
That is false information, to be honest. The page is temporarily removed, but the method is yet to be patched by Grammarly. I have created myself a new premium Grammarly account a moment ago, with the public method. So, I'm pretty sure you are using the public method. I can give one premium Grammarly account to the first person to PM me with their unregistered preferred email, username, and password. First come, first served.
P.S. Please don't PM me for method. '_'
Edit:
This offer was taken by
MagicIsMe.