> The two things aren’t contradictory at all, in fact one strongly implies the other. If AI is writing 90% of your code, that means the total contribution of a developer is 10× the code they would write without AI. This means you get way more value per developer, so why wouldn’t you keep hiring developers?

Let's review the original claim:

> AI will replace 90% of developers within 6 months

Notice that the original claim does not say "developers will remain the same amount, they will just be 10x more effective". It says the opposite of what you claim it says. The word "replace" very clearly implies loss of job.