I could be wrong, but I think he'll be on much more than that, based on what little I know of the big Prem clubs wages. A good mate of mine is a teacher and one of his students has just signed as a first year pro at Liverpool, 17 years of age, standard LFC youth contract apparently, 2 years, £5k per week. So by his 19th birthday, he'll have earned just over £500k + sponsorships etc. if they then go on to the next contract, up to 21 ish, I'm pretty sure that goes up from there. Its bonkers really, so when they're on loan, most clubs in L1/2 no way can afford their wages...
When he was at school, Liverpool paid for everything; e.g. my mate was behind him in the canteen queue, cashless card system, he had a balance on the card of £12k !!! Not sure what they expected him to eat!
Moneyball indeed!