I think 'shyster' is a bit harsh to describe someone who has given a substantial amount of time in service of his country, and wants to help those who wish to do the same.
I do agree that paying for a prep service is unnecessary, but that said how many in-service success stories would we have seen without the help of the vast number of commissioning clubs we see across the service? If you have the money (although I don't see any pricing on his website, so can't really quantify that), and you want a helping hand ahead of applying for a commission, then why not?
I would question the use of a foreign frigate (I'm going balls out with a stab at OHP variant, Darwin class maybe?) on a website looking to assist recruiting into the UK armed forces, and the phrase '11 years as a Sea King pilot' - come on Al, 11 years total service maybe......
Good luck to you mate, and sorry to see the med discharge.