@Yochanan spectre-meltdown-checker has a False positive for CVE-2017-5715 on linux 6.9, retpoline not recognized · Issue #490 · speed47/spectre-meltdown-checker · GitHub
The Reporter also added a solution for Linux 6.9.x
RETPOLINE check needs to be replaced by this:
grep -q '^CONFIG_\(MITIGATION_\)\?RETPOLINE=y'
I am not sure how fast the maintainer of the project will be to add this fix.
Not a April fool but it was reported on 4/1