because the price of the full game is priced at £64.99!
I like people who pull numbers out of their bum. Too bad the article itself states "MSRP N/A" - In other words there is no set retail pricing.
I think £64.99 was mentioned as that's the price of it right now on Origin (it states "£64.99 RETAIL PRICE - Pre Order"). At least it wasn't just a random number plucked from thin air.