Don't get bogged down by this intense, hyperintense nonsense. Find your son a good S&l therapist and together you should be able to decide how much and how often your son needs s&l therapy.
My daughter's s&l therapist was wonderful and always made certain her sessions were age appropriate and fun. For her first session with our daughter she came stocked with games and books etc but when she saw my daughter was in the middle of playing with her Barbies, put them aside, sat down with her and did a whole session just playing Barbie with her. My daughter had no idea she was getting "intense" or "hyperintense" s&l therapy, she just thought someone was playing with her.
People who don't know are always quick to label what they don't know.