I'd hoped the 45,000 feet figure had been kicked into touch by the time I got back here, seems it's still being argued over.
IMHO a Rolls powered T7 at that stage of that flight isn't going to close to getting get up there.
And yes I've done many performance courses and operate (at times) a Rolls powered T7.
Now OTOH if there's proof that there were significant height excursions and that that the aircrfat then continued onwards in stable flight I am minded to think back to a notorious incident a European airline had probably well over a decade ago.