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Tout le monde connait Bob le Flambeur.

https://www.imdb.com/title/tt0047892/?ref_=fn_al_tt_1

https://en.wikipedia.org/wiki/Bob_le_flambeur

Sort of a French Ocean's Eleven in the 1950s.

“Flambéur” isn’t right but “flambeur” means something else entirely (gambler). “Flambéer” would be more legitimate but would be hard to decipher. The title tag plays it safe and uses “flambé restaurant server”.

Flambeur with this meaning is a metaphor (it can mean gambler, or just overspender).

Its literal meaning as "quelqu'un qui flambe" remains correct too.

like somebody who "burns through money"

"flambeur" means someone who sets things on fire. Either literally, as in this case, or metaphorically, as in money.

This article isn't in French, it's in English.

In Louisiana, might it be flambeaux?

that means torch (the traditional kind, not electric)

And more specifically, torches (plural). A single torch would be "flambeau"

I read it as flâneur.