Did you set up initrd?
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Plymouth isn't really designed to be built from source by end users. For it to work correctly, it needs integration with the distribution. Because it starts so early, it needs to be packed into the distribution's initial ram disk, and the distribution needs to poke plymouth to tell it how boot is progressing.
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info on how to create initrd
https://docs.slackware.com/slackware...generic_kernel
Section: "You will need to create an initial RAM disk (“initrd” for short)."
Hope that helps you a bit on the way, as I've never used plymouth
