That's not what he said. He stated he doesn't have the experience almost every F1 driver has, yet still had more pace than half the field.
I object to that, "more pace than half the field"? Well Williams was quicker than half the field I'll grant you that. I'm pretty certain several drivers stuck with slower cars would have driven quicker laptimes than Bruno. Starting by Vitaly Petrov who was quicker than Bruno as his team-mate before, adding certainly Timo Glock and I heavily suspect the Toro Rosso guys as well, at least Ricciardo (although we have no basis for comparison there). Plus Williams on the hands of Maldonado looked quicker than the likes of Sauber, Mercedes and Force India on several occasions, on the hands of Bruno it never did.
With endurance racing somewhat back on its way up and being part of an official FIA world championship nowadays, moving from the fringes of F1 to the WEC is more and more of a sideways step instead of a backwards one.
I'm sorry I respect the WEC as the peak championship of a different category, but no way it's a sideways step, ask Bruno if he wanted to move there or to stay in F1, ask most of the frontrunning WEC drivers if they were aiming for a F1 or a sportscars career. And where they would rather be at the moment.
It's stronger than it was a couple of years ago (when there was no FIA world championship) but this isn't the 1950s or 60s when it was an established equal to F1.