The point here, I think, is the amp is broadband and will produce Kw plus 1.7-Fm bands. Just Driver protection and of course clean the bands with harmonic LPF. The class C mod is said 80 percent efficient at VHF. I would expect same HF.
If it could do kw peak, then surely it will do 300 watts fully modulated AM.
Now here is another FET miracle amp with 5 watts it pushes 1.7 kw.
The demo person shows power on Bird watt meter Vs a Chinese watt meter. Well, they seem right on.
So Class E Be fine if you are a high power licensed station, because the electric utility bills are quite a bit less with 50Kw output.
But , again the technology is there for trade offs and choices.
BTW I have several BCE Bricks.. one does 300 watts and it runs stone cold, drives with 1 watt.
I assume it has to be class E design, but its not a new amplifier, had it in closet for ten years.
Go here:
https://www.youtube.com/watch?v=5nYH-bdt_iw