Here is the instruction web site of a dive shop that offers tech instruction through GUE, TDI, and PADI. I suspect that the owner of the shop must believe that it is possible to get quality tech instruction from any of those three agencies.
For those readers who are not aware, that shop, Extreme Exposure, is the home of GUE. The shop owner is the founder of GUE.
Maybe an instructor affiliated with EE would be a good person for the OP to ask the original question to.