I imagine most Tesla technicians have limited experience removing the airbag module since they primarily work on "supported cars", which means (1) it's not salvaged (2) and probably never been in a serious accident. Although, I could be wrong.
You are probably correct, but for the wrong reason. Most cars that would need the airbag module worked on would be handled at a body shop, so the body shop personnel would deal with the airbag module and not Tesla technicians. (Though I suspect that they wouldn't even need to pull it out, they would just hookup their laptop load the Tesla Toolbox software and do whatever needs to be done.)