Sutekh The FA really don't help themselves do they? 5 years for this to be sorted plus, it seems, precedents have been much less harsh. Question has to be asked though, how did they go down this route in the first place, they must have known it's illegal. Would the agent concerned also face some form of punishment?
They basically decided that the player was worth the risk of non-compliance and any expected sanction. Which they clearly expected to be light and confined to the club. Even £200k fine to the club 5 years ago probably seemed trivial compare to the potential benefits.
Or tried to use trickery to work round the restriction and failed.