It also feels like that, but in documentation is block diagram any as
in the description and the detailed scheme then follows
RF PA - standard PA with two MOSFET
IMC - impedance matchng circuitr with L C for matching Z1 output stage PA to Z2 probably 50 Ohm
LPF - 5th L C filter for produce pure sinus
CVCC - technical LC see first post. The documentation says
1. .... he circuit is primarily a constant voltage regulator which uses the CVCC to produce a constant current.
2. .... a constant voltage to constant current circuit is the subject of the invention number xyz (Unfortunately, this is an invention from the 70's and cannot be traced online)
3. output from LPF is supplied to the input stage of the CVCC which stage constitutes the phase shift network of the CVCC and convert constant voltage to constant current
The pig knows it.
The load is in real complex variable impedance