I blamed back as far as I could stomach the Salsa UI: https://salsa.debian.org/kernel-team/linux/-/commit/ba8a8dcf45455676fcb47c4796f7ca39ef3b1c59 is the commit that changed from "a mix of HZ=250/HZ=1000 per arch" to "HZ=250 everywhere", dated 2006-04-30.
Per tracker.d.o, the first cpulimit upload was on 2006-06-15, so this was never right for Debian kernels.
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