Step 8.
Readings on a Bird 43 power meter now indicate 95w forward and 20w
reflected, meaning only 75 watts are now delivered by the source and
absorbed in the mismatched load. The 20w reflected power remains in
the coax, and adds to the 75 watts delivered by the source to
establish the total forward power of 95w.

Point in response:
The Bird 43 indications only reveal mismatch loss (unstated as 5W if
we are to return to the concept of Available Power, which as a
rhetorical point has been uncharacteristically discarded) which is
only tangentially related to the subordinate thesis: output source
resistance of the RF power amplifier is non-dissipative. Step 7 is
sufficient to illustrate the thesis.

73's
Richard Clark, KB7QHC