A fixed ratio makes sense in the context of how a particular company operates at a particular time. Given the example strategy you're quoting is about one company (real or hypothetical), and it doesn't say that the infrastructure teams are going to gain or lose a bunch of responsibilities from what they currently have, it seems pretty clear. When you add in "Particularly we will avoid hiring that grows our current headcount." the result is that they're aiming to keep about the same number of total engineers, and therefore about the same number of infrastructure engineers.
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