Interesting quote from his site:

"Every feature in a handwriting has to be looked at in the context of the
whole writing. When we do an analysis, we are solving a mystery, and
much like Sherlock Holmes or Hercule Poirot, we must look at all the
evidence, both the parts and the whole.

You will learn that a particular handwriting feature may be modified, or be
expressed differently in different writings depending on other things in the
writing. You will also learn, as was just illustrated, that what in one
handwriting may operate as something neutral or positive, may in another
type of writing have a negative impact, or at least be a source of conflict
for the writer.

You will also learn not to overlook clues to personality that have nothing
to do with handwriting per se, but rather are unconscious expressions in
the form of what we call "graphic gestures." A graphic gesture is
something writers do that have nothing to do with communicating
through the alphabet, but nevertherless reveal much about their
unconscious motivations. Doodling, adding flowers or smiley faces,
crossing certain things out, using a particular type style or font on a
person's business card - all of these are examples of graphic gestures
that reveal a lot about people's personalities."

I wonder how much of his analysis depended on the client and the client's expectations when the report was delivered.