The fuel nozzle is a completely mechanical implement - there’s nothing electronic about it, and the pump has no idea whether you are manipulating the trigger or using the hold-open.
Because it’s mechanical, however, the way the hold-open is designed needs to allow for further actuation of the trigger mechanism to free up the hold-open lever when your tank is full. Because of this, the highest setting on the hold-open is less than the full actuation of the trigger mechanism.
I guess it’s good that both parties deny the allegations. The problem for Tyson now is that questions about this and the past Shadman support are going to follow wherever she goes.