So it's a technicality? Technically every bridge bears his symbol, but no, "celebrating" him we are not.

I mean you have to willfully interprete the word "celebrating" as people dancing in the streets out of joy to read the parent's parent comment that way.

In other words: "It's in the background" rather means it's the foundation upon which (as other comments have pointed out) the French Revolution's winning side's narrative rests.

"It's in the background" means exactly that. They are just bridges that we cross to get from A to B, without a care in the world for their alleged symbolism. We just don't care.

I interpret "celebrating" as remembering something in a positive way. We're just indifferent, he's one of a few dozen important guys we heard about in history lessons, and that's it.

This is like saying that the continued existence of cathedrals is a celebration of Christianity. The République celebrates the Napoléons as much as it celebrates Roman Catholicism or kings: not at all.

Also, those are old bridges/columns/whatever. The French are not erecting any new structure bearing his name or symbol.