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Re:Mac OS High Sierra automatically checks EFI firmware each... by AgentEpsilon on Sunday September 24, 2017 @08:05PM (#15327184)
Personally, I use rEFInd to manage my MBP's OS installs. I know that it installs itself to the EFI partition, but would that cause this service to identify an insecure/corrupted/whatever EFI?
Re:Mac OS High Sierra automatically checks EFI firmware each... by kogir on Sunday September 24, 2017 @08:11PM (#15327209)
rEFInd is just an EFI application. It doesn't replace the system EFI firmware (which runs before, launches, and provides services to rEFInd).

As to whether or not this tool will flag it, I suppose you'll find out shorty after installing High Sierra.