If the signing hadn't served any other purposes besided getting a player Lucho requested, the interim board wouldn't have announced it a few days before the elections.
It's bullshit to assume that another club would've signed him if we hadn't made the deal officiall within days because he confirmed that he 1.) didn't have any other concrete offers and 2.) he only wanted to play for Barca
Why would the club risk money by signing a player who could be sold back to Atletico in a few days and by printing hundreds of kits and sell them in the Megatore.
The interim board should have done the only legit thing: let the new President talk with Lucho and sign the player.
The candidates have every right to complain about the signing since the interim board is NOT ALLOWED to do it but everything's fine I guess. Legal issues become much less important when Laporta, the man who dated a porn star, sits on the other side of the table.
(Even if it would be allowed to sign a player during an election process, the timing of the announcement would be beyond odd)