My son and I were discussing this crash last weekend.
He’s more knowledgeable on this stuff than me.
If electronics, gauges, displays fail, 75% power, 5 deg. nose up. hold the wings level.
At high altitudes the safe envelope is very narrow. High angle of attack...stall. Even at relatively high speed.
Too low angle of attack..over-speed.
Sounds fishy to me. If electronics fail, you can’t see 5 degrees nose up, and why do that anyway? Just maintain level flight using the baro altimeter and set the recommended max range cruise power setting for a/c weight per the manual. Declare an emergency and request vectors to the nearest suitable landing field.
JC