Erm, no. Aluminum + Iron oxide (from the building)= thermite, which burns hot enough to dissociate water into its atomic components. At that point, the oxygen just contributes to the burn. I’m not a chemist, but I know enough about thermite and oxidizers to posit that there might be something to this theory. Metal fires are very real, and can be really ugly things.
Quite possible, an exothermic reaction.
Interesting.