that is correct.
the central issue is, that initramfs isn't truly a filesystem, but rather a way to populate the fs-cache without underlying backing filesystem/blockdevice.
Its an elegant hack that doesn't create a real mountpoint, so you can't pivot it out of the way.
initrd was actually creating a filesystem, but needed way more code to support it, so you could pivot away from it.
The issue isn't about the first real filesystem, but about the fact that initramfs creates a world before, without any true filesystem/mountpoint.
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