That's a misunderstanding based on loose definition of "vibe coding". When companies threw around the "90% of code is written by AI" claims, they were referring to counting characers of autocomplete basing on users actually typing code (most of which was eequivalent to "AI generated" code by Eclipse tab-completion decade ago), and sometimes writing hyperlocal prompts for a single method.

We can identify 3 levels of "vibe coding":

1. GenAI Autocomplete

2. Hyperlocal prompting about a specific function. (Copilot's orginal pitch)

3. Developing the app without looking at code.

Level 3 is hardly considered "vibe" coding, and Level 2 is iffy.

"90% of code written by AI" in some non-trivial contexts only very recently reached level 3.

I don't think it ever reached Level 2, because that's just a painfully tedious way of writing code.