It is different, he’s just being dishonest.

If you block someone else on Twitter, they can’t even see your profile at all (muting still allows them to see your profile and interact with everything you post or retweet). Sure, it tells them they’re blocked, but this also means they can’t interact with anything you post at all. If they want too, they’ll either have to make an alt account (someone most are too lazy to do) or ask fellow toxic assholes to screenshot your posts for them to see.

Muting is useless when dealing with harassers. It’s why the block feature was added; because minority communities begged for it.