Yeah, that's clearly nonsense.
If it was true, how would anyone know (unless you bought the grill badge to sit next to your AA badge)?
once passed if you get points on your licence you get more than if you didn’t do the course
"I'm a black belt in karate, so legally the police consider my hands to be lethal weapons"
I thought about doing the IAM motorbike course a few years ago, but then I realised that about half-a-dozen of my motorbike club-mates had passed the IAM and still rode like blinkin' idiots (and at the same time were really condescending towards anyone who hadn't done the course). So I decided it wasn't worth the effort. Buy (and read) a copy of Motorcycle Roadcraft: The Police Rider's Handbook, you'll learn a hell of a lot.
My mum started doing an IAM course (mature driver i think?) a decade or so ago, ended up with the chair of the local group. She just wanted to freshen up her driving and get some pointers.
Then after a number of sessions, she had to excuse herself from the bench when he came up in front of her on a couple of driving offences that he'd decided to fight. Got several points, a big fine and a ban due to totting up.
Ooops.
She didn't go back to the IAM.