Did everything as mentioned,
But plymouth not showing in boot, i am just getting the default boot of endeavouros.
I did see some red lines in the boot though , but it was too fast for me to read anything.
plymouth is installed properly and the gui settings is also there in quick settings, everything else also alligned with the info mentioned in the post.
While playing with plymouth to use it on the Framwork 13 i created this little repo, it has basic tutorial, and in case a very dangerous package to be used https://github.com/killajoe/eos-bgrt
I went a year + without transparency do to a typo. I put xrandr instead of xrender in my picom.conf file and it took me forever to find that stupid error.