what about lead? what do you think UPS batteries are made off? Do you know what a UPS is?
please point to a single debunker jumping up and down saying "its aluminum it's aluminum"
and since when is your evidence definitive? who do not know whats in that flow so cannot say it cannot be this or that because you have no way of telling. Was it PURE Al....almost certainly not so why would you think pictures of what PURE Al looks like when molten is relevant....was even the temp the same? how can you tell???

What we do know is that its very very unlikely to be steel.