That’s not a universally accepted opinion…because everybody’s diabetes, goals of control, etc. are different. For my insurer, the medical policy for coverage does not disqualify people with “good control”. Whether or not to use a pump, and when to start on a pump, is something he should assess by reading up on it, talking with his doc or endo, maybe go to a CDE and look at some pumps and learn about the ins and outs.
To help the OP’s brother assess the cost of a potential pump, he has to gain some understanding of his insurance details. The ins and outs of co-pays, out of pocket max, deductibles etc. will all affect the cost. The pump manufacturers have a sales force who can deal with his insurer and get these details sorted out.
For me, I read up on pumping for a few years, went to my endo for a prescription/recommended pump model, went to a CDE to look at pumps and ask questions, “signed up” for a pump on the Insulet (Omnipod) web site. After that, Insulet had several people who were very helpful and got me all set up to start with a pump in January. They struggled a bit with the prior authorization process with my insurer but they got it all done and covered/ordered before the 2019 year end. I got my initial order of Omnipods covered in December this way because I had hit my 2019 out of pocket max and only had to spend $75 for 3 months of Onmipods plus a controller.