He gives his view that it is "technically an Aurelia" but that is quite incorrect. It is different in so many ways, not least in having a B pillar.
Different in so many ways, yes... in terms of the mechanicals the beautiful wishbone front suspension being the real revolution, but it is true that this early Flaminia has drum brakes (possibly the same as a late Aurelia, someone here will know) when all later ones had disks.