You could only conclude that if they would have dropped LLMs completely. It just means they see the benefit/cost optimum at a lower point than 100k/programmer.

I also doubt a longterm 2x multiplier for most developers.

I don't think you need the LLMs to be completely dropped to indicate this. Even entry-level faang programmer salaries are in the 300k range, so the fact that LLMs aren't worth 100k/programmer does tell us something about the marginal usefulness. If the drop was motivated was motivated purely by price-per-output, it would indicate the LLMs are less useful than adding another 1/3 engineer. However, as discussed in other comments, there are other motivations as well, notably dogfooding homegrown tooling.