Whoever made this page, certainly isn't being completely honest. Twitter is only charging for SMS based 2FA... which is far less secure than the freely available options offered... if people want to pay for the SMS based and be less secure, that is their prerogative.
Twitter just made me disable my SMS 2FA setting, reserving the feature for twitter blue users.
It's a weird decision on their part, they still allow me to use an MFA application or a hw key, just not SMS.
SMS 2fa is understood to be the least secure form of MFA so I am surprised Twitter only reserves it for their twitter blue users.