Sadly, torture is an industry. Much like so many other aspects of our intelligence agencies, the job is often done by third party contractors.
The most famous is Mitchell Jessen and Associates, see https://en.wikipedia.org/wiki/James_Elmer_Mitchell#Work_as_a... , but it's not the only one. Margot Williams published articles about an airline company used to send people to black sites across the world.
Besides a few anecdotes, how many torture debriefings have you read and then cross checked?
Unless you’re in the industry, how could you possibly think you have an informed opinion on methods of intelligence gathering?