He delayed the case enough (almost 13 years) so that he's now more than 70 though and I doubt he stays to long in prison because of his age.
But it's nice to see that he couldn't run away from justice forever and is finally in jail.
His case is going to appeal but the court decided to still jail him now "provisionally" (exécution provisoire), which sounds like a political play. Coincidentally, the same is happening to Le Pen with respect to the decision to ban her from elections...
As for "delaying" the case, this is just the French court system for you. Everything takes years and years.
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.
I cannot be sure of what is happening (hence "seems") but neither can you, especially regarding decisions that are discretionary.
At least here there is a guilty verdict even if not final. In France people can be jailed for years without a trial...
Sure, but also, he did the crime. There can not really be any doubt for the people who followed the trial, and the judges have shown extreme caution, rejecting charges when there was the slightest doubt.
The political opinion or lack thereof of judges is irrelevant.