Just as constructive interference functions to
increase antenna gain in one direction while
destructive interference functions to decrease
antenna gain in another direction, in a transmission
line at a Z0-match point, constructive interference
functions to increase the energy flow toward the
load while destructive interference functions to
decrease the energy flow toward the source.

I cannot follow your reasoning as I cannot understand what is a "Z0-match
point".

In my understanding:
- if the transmission line end is mismatched, in no point impedance can be equal
to Z0.
- conversely if the transmission line end is matched, impedance is equal to Z0
in all points. But there is no reflected wave and hence no energy flow toward
the source

Then, your "Z0-match point" must be something else which I cannot figure out.

73
Tony I0JX