Bridges are not really the issue, they have a lot of space to dissipate the shockwave.

However the manufacturer might be expecting a significant business through the alps, given the base tunnels Switzerland has been digging.

That would make high-speed tunnel entry a larger concern than it’s historically been for the french market (most of the tall mountains are on the edges of france so high speed lines don’t have a surfeit of tunnels, probably unlike japan which is rather mountainous).