I haven't reread the whole document, and I don't think it says how to deactivate it. That said, you mention that you don't have the problem if you change the keyboard. It is possible that it is a problem with the key which launches the programs, it remains activated, which makes that it starts again at startup!
Expert volontaire :Forum Fr 17-10-2009 :
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Normally you need to press the F2 key to run the HP PC System Diagnostics UEFI. If i press the power switch and immediately press the F2 on my Elitebook 840 G3, the System Diagnostics UEFI will appear. So make sure the F2 key on your new keyboard is not stuck pressed.
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