first of all that article is very old (3+ years) and secondly it is not even well written. and there are a lot of these articles and topics all over the forums. and in the end people make mistake themselves such as leaking their 2FA key or their password or even I saw leaking their API keys and then blame the services.

I strongly recommend enabling your 2FA, you are ignoring a very strong layer of protection. and learn how to protect your account properly instead of reading BS articles on random sites.