It is not political play. This is FUD spread by his political supporters.
The "exécution provisoire" is a measure that was introduced when his own party was in power, to make sure that terrorists were jailed immediately. He happened to be condemned for breaching the same law (association de malfaiteurs) that is used against terrorists.
I once read a comment by a lawyer that he was amazed by the number of politicians who ended up being caught by laws they had voted for. This is what happened here.
In fact when he was president he implemented another law, on minimum mandatory sanctions for repeated offenders (peines plancher) which was repelled by the subsequent administration. He would have been caught by that too otherwise.