According to this article, yes the superstructure is aluminum which surprised me. I thought aluminum on major combat vessels was out of favour due to HMS Sheffield‘s loss in 1982 during the Falklands conflict.
That would surprise me too. Sheffield's superstructure was steel. The transcripts of several inquires including unredacted Naval BoI are available online. If I can find a copy or current links on one of my external disk archives I'll post it sometime, but the physical causes were many including inappropriate materials used to insulate data cables which generated high volumes of toxic smoke and burnd wonderfully well, habitability improvements to messing which were fire prone, and mandated operation of the fire pumpsystem in a manner appropriate to *internal* risks not *external* risks which led to it being made entirely inoperable with the initial hit.
I wouldn't bet on it, but I think a good search of the literature will find that the whole aluminium superstructure thing is at least
in part an urban myth. Antelope and Ardent *did* have aluminium superstructures which were not involved in their loss.
oldsig
(Edit: Ooops, wrote this hours ago and didn't hit post. NOW the bloody thing is a zombie post)