This is not really a "new" technology. It was originally called Ampliphase and was invented in 1935. See :
http://www.rossrevenge.co.uk/tx/ampli.htmIt wouod seem that this technique might be suitable for Class E transmitters. Simply put, you would just use two Class E bricks and a combiner, as might be done to achieve hgiher power in the normal sense. But, instead of PWM modulating the high voltage power supply, you run the transmitters at full bore, but phase modulate the input drives in opposite directions (+/45 degrees) instead. You need wide band circuitry to ensure that all the PM sidebands can cancel. The big issue has to do with how the combiner reflects the adding and opposing RF voltages back to the two Class E bricks. Might just go "PZZZST".....
The above article and others discuss the non linearity between the phase shift and output amplitude. There was also the need for multiple pahse shift stages to accomplish the desired amount of phase shift.
For anyone interested, you can use a PLL to make a phase mdulator as I did some 30 years ago in a homebrew 2 mtr FM transmitter. A PLL is a closed loop system that locks a voltage copntrolled oscillator onto an incoming signal, usually at 90 degrees. Any shift in the pahes of the input signal produces a correspoding error volatge form the phase detector, and that is used to alter the phase of the VCO to trask the input signal. Well, if you introduce an additional voltage (audio) to the error voltage, the VCO will be shifted in phase to an amount needed to conteract the added error voltage.
So, you start with a carrier oscillator, feed it to two PLLs. In the above article, they mention having the two drive signals at 135 degrees with no modulation. Youo could use a simple pair of RC and RL networks to make the two PLL inputs be out of phase by 135 degrees, or even use a 4x carrier clock and dual flipflop circuit to get 90 for starters and add a DC bias along with the audio to set the resting phase to 135 ( +17.5 on one and -17.4 on the other). Audio would then be added to swing the +/- 45 degrees with the two audio signals at 180 degrees.
You still have to deal with the non linearity of the phase combining technique. And, there is alos the issu of what happens with over modulation....well, at least there is no flat topping or cut off splatter.