It's been widely reported that the coach of a side that lost in unfortunate circumstances to Argentina whinged a lot about the match officials disallowing one of his side's goals. This is normal, as is media reporting on silly conspiracy theories. Since the article the super conspiratorial "all Argentine refeering team" also failed to do any damage to France's prospects against Morocco whatsoever, and the Norwegians have joined the Ghanaians in complaining that England have been getting scandalously bad decisions too!
Nobody with an adult understanding of sport honestly believes that the ban for Quansah is some sort of conspiracy to guarantee Argentina won. I mean, apart from him getting the normal ban for a bad tackle, the only chance he'd get of making the starting lineup against Argentina was as an out-of-position option that would by marginally easier for Argentina to play against.
The "mistaken identity" rule was very clearly changed before the World Cup to allow it to be used to review decisions when the referee mistakenly carded a player or awarded a penalty for something actually caused by his opponent (not just when he booked a different player on the same team). Your assertion is simply false, as your own link confirms. Also, of the few "mistaken identity" decision reversals, Embolo's ridiculous dive to try to [initially] get his opponent into trouble was by far the most obvious and deserving. But yes, losing sides will generally whinge more about rule changes which mean their player can't get away with cheating like he might have done in the past than they will about their player's decision to cheat costing them a game they might have won.
Really, the only major decision involving Argentina that's not completely consistent with other games was Messi avoiding trouble for accidentally studding an opponent's calf (a bit like the much-debated Balogun incident) in a low pressure group stage game, and we don't need a massive conspiracy to understand match officials might be scared to send off the world's most famous player in his last tournament for an inconsequential bit of clumsiness, if they even saw it clearly.