Cecil Moore wrote:

I've always known that a graph drawn with a pencil on a piece of paper
is not an EM standing wave but, for awhile, you seem to have forgotten
that simple fact.

A plot is simply the graphical representation of an equation. Since I
was the one pointing it out to you, it seems you are the one who had
"forgotten that simple fact".

The envelope is also not the wave.

It all comes from the same equation, Cecil. If the thing which
amplitude modulates a wave cannot be called a wave, then what should
it be called?

ac6xg