Ok, I used their config and I see this:
resume # [ 0.948879] systemd[1]: Found device /dev/vda1. resume # [ 0.949179] systemd[1]: Mounting /sysroot... resume # [ 0.949847] systemd[1]: Starting Resume from hibernation using device /dev/vda1... resume # [ 0.951809] systemd-hibernate-resume[115]: Could not resume from '/dev/vda1' (254:1).