No. Disney is very strict with travel industry discounts because of risk of abuse. You can book only one room with them and the industry member must stay in the room and present valid ID. There is no "I'm a TA and we're going at the same time as my best friend so I'll book her family a room too." It's not like AP rates where you can book 3 rooms and they may or may not ask to see your AP when you check in. It's also not like the "I don't have a PIN but a CM booked this code for me without one" and the rumors of reverting to rack rate at check in but no one has actually reported having this happen to them. They WILL revert you to rack rate if you don't have valid proof of eligibility. I actually do know people who have had exactly that happen. One person who bought into one of those "give me $495 and I give you a 'TA card'" sort of deals. They had the card but didn't have a valid agency IATA certificate and eligibility list so they were charged rack rate. One person who was an airline employee at the time of booking but not at the time of travel and another who legitimately was a
travel agent but didn't have an IATAN card yet and tried to get away with saying she did.
You also can not book in his name and use his discount unless he is there with you at check in and presents his proof of eligibilty.