I don't see the message on my new 2018 MBP
Just to double check, did you do: Disk Utility -> Select "Macintosh HD" drive -> First Aid -> Run and then click "Show details" and then scroll through the entire output to check if there were any crypto_val warnings?
Thanks
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Otherwise, all this is saying is the drive isn’t encrypted
That's worrying, my FileVault is definitely switched on... (I've double checked in System Prefs)