So, I should be FORCEFUL and demand "DON't DO ANYTHING" or you will not get paid ??
Pretty much. Don't let them take it in the shop and hook it up. The Remote should just be a monitor, I think they have to hook up to a larger computer get the actual flashes. If all you are paying for is diagnosis then updates should be off the table.
just connect the two wires at the drivers side seat belt under the seat,
Short answer, no. Will not defeat it on all trucks. Will not work on out of park alarm safety recall.