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Sounds very similar to the macOS 10.15.6 release, which had a horrible kernel memory leak. It was especially visible when running virtual machines. After a few hours the kernel memory pressure was so high that it would oom kill every usermode process one by one, including critical system processes.

That one had me yearning for a linux grub menu entry for "previous kernel".

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Is kernel memory pressure different to the normal memory pressure? Or is it the same thing?

It's fundamentally the same thing, but when the kernel is refuses to deallocate memory you can't just terminate the process, you have to reboot the system.

The kernel memory usage would only show up with ever-increasing numbers in "sudo zprint", it wasn't visible in activity monitor

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