There is like 5mln tutorials

Dont really care, every time i tried plasma it was trash - just an unstable mess of setting that randomly unexpectedly break

Why does it say 54 comments - but I dont see any?

Personally I given up on pihole.
it’s just caused too many issues blocking sites that my family were using.
And then even for local DNS use case - I figured it makes no sense for me. I can just configure one of my real sub domains to resolve to local IP and be done with it.

No idea what specifically is your issue - but can’t you just connect the pihole to monitor and keyboard and look at the logs?