I assume people are pissed off because its building something that people already hate and its a fully AI generated post that is jarring to read.

Nothing pisses people off faster than calling up and getting put on the line with a robot. Like if we're thinking about this problem and how to solve it we can look at other examples like a website with a booking form,call the mechanics cell directly, hire a receptionist or worst case outsource the receptionist to a booking agency.

The poster has built something that, while technically interesting, is profoundly annoying as a user and deserves to be backlashed to prevent more of this kind of stuff to be built

Just how much effort even went into this? The project is LLM generated, the blog post is LLM generated. It produced something that is really annoying to deal with as a consumer. The last thing I want to talk with when calling a boutique garage is some AI receptionist.

Why should people be impressed by this?

Agreed. Typical HN.