This is a very good answer. Another thing you might do is ask the same questions to each tech individually. Maybe both approaches.

You’re not. The only “filter” modern Hondas have is the pickup screen for the fuel pump inside the tank. Just do what the maintenance minder tells you to do.

Sounds like he needs to do a cylinder leakage test to determine why the compression is low. Most likely you have worn rings on cylinder 4. If so, it’s time for an engine rebuild or replacement. For a wild guess on price, I’d say $3000 or more.

If it was slipping it would set a code for that, you’d have a bunch of lights on the dash.