We were working on the psoas muscle around 2005 after my Pilates teacher had introduced me to the work of Liz Koch.
It had a passing relevance to the kung fu but was overall just something of interest rather than a key element.

Years later, I was told that an ex-student (a beginner) of that time was now teaching tai chi and that his website predominantly mentioned psoas and Liz Koch.

There is an Indian folk tale about six blind men inspecting an elephant:

The first man encounters the side of the animal and believes it to be a wall.
The second man imagines the tusk to be a spear.
The third man thinks that the trunk is a snake.
The fourth man considers the leg to be a tree.
The fifth man feels an ear and believes it to be a fan.
The sixth man finds the tail and is certain it is a rope.

This ex-student appears to have based his understanding of tai chi on those few lessons from 2005.
Unfortunately, he still thinks that the tusk is a spear and does not yet see the elephant.