Calling it a “second kernel” implies one process space
How to Throw a Tantrum in One Blog Post
David Timothy Strauss

you do realize that it's a hyperbole. One that has already been used to describe what seems to be the intention of systemd: isolate the actual kernel into an user-space wrapper API for all other applications to call. Mutatis mutandis: a "sort-of" second kernel, in user space. Again, look up:

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