Not at all. Chock and Bates didn't perform poorly at Worlds; indeed, their score was only slightly less than their season's best at the Grand Prix Final. The closeness of the two teams reflected Gilles and Poirier's scoring increasing, not Chock and Bates lagging.You're forgetting that at Worlds, Madison Chock was skating on a fragile injured ankle (which collapsed on her in the FD at the Olympics), so C/B couldn't perform at peak ability. Maddy had surgery right after Worlds and has recovered completely.
Whatever your hopes, there are realities. Home scoring is a reality of the sport that has to be taken into account when assessing things.I would hope that the performances on the ice and not 'home scoring' would determine the outcome of the competitions at the GPF.
It's not any kind of guarantee (just ask Cappellini and Lanotte, narrowly missing the podium in Milan), but it's a factor.