The Tech demonstrator being tested has three J85s from a F5 That is literally one tenth the thrust of a Concorde with four Olympus engines.

if their plane is to be as big and fast as Concorde it would need three engines of 40-43,000 lbs thrust DRY The most powerful engine available is the PW100 with 28,000 dry and the US won't let PW sell those as we need them all for the F-35.

I predicted they never build a full scale prototype after this demonstrator.