You didn't read closely enough.

“Replit QA’s it itself (super cool), at least partially with some help from you … and … then you push it to production — all in one seamless flow.”

Replit is an agent that does stuff for you including deploying to production. If someone don't want to use a tool like that, I don't blame you, but it was working as it is supposed to. It's a whole platform that doesn't cleanly separate development and production.