Pureboot flash error message

I just reflashed my Librem laptop with Pureboot update which is something that I have not done in a while, and in the process I received a message that warned I was not using approved hardware for the firmware and that it could create problems and that it was proceeding at my own risk. I was not fast enough to copy the entire message. Nothing seems to be wrong, but is this message normal?

If I remember correctly, I saw this message too on my Librem 15 v4 at each PureBoot flash, which I did twice.