I think he means use another user interface dApp. Steemit.com is a user interface App built on the Steem blockchain. Just like steampeak, steeve.app etc are apps built on the Steem Blockchain. They are just different front ends to use the blockchain. This post isn’t posted on steemit.com, it’s on the blockchain.. and can be viewed there on any front end.

Like here https://steempeak.com/partiko/@anomadsoul/contest-my2018-just-a-normal-day-or-100-steem-in-prizes-8454b0263244dest

Just many different ways to use the blockchain, which many users aren’t aware of. I think he’s trying to spread the message about them.