It's wrong because you can sign a player, but not register him from a competition. Usually clubs do it with players who aren't eligible for a visa at the time of the acquisition, and they simply loan them out.
By the way, you managed to say he won't sign and he will sign in the same post. Bit contradictory.
At the end of the day, in my opinion, under an embargo, you shouldn't be allowed to contact anyone about signing or loaning a player into the club, apart from free agents. To buy them and then bring them in later seems to me like a cheap and easy way around it.
I haven't said he will and won't sign in that post? Unless you think that a pre-contract agreement is the same as signing someone there and then?
At the end of the day, they've worked in the rules. It don't matter what your opinion of it is because you're wrong.
I don't see how it can possibly give them an unfair advantage to sign him in January rather than now.

