If someone mentioned any of this, apologies as i haven't read previous posts; otherwise..
1) some random low level employee making a mistake is always a possibility, this wasn't exactly a public statement we're dissecting here; they rushed with this (techpowerup), i wouldn't take it as fact.
2) 'electrical' can mean a great number of things, only a few of which are directly related to VRM, which is how techpowerup 'translated' the issue and term.. 'electrical' could be related to the new X570 chipset (which i'd remind is to be made inhouse by AMD this time around, unlike say the 550 and 530), to the PCIEx4.0 wiring/tracing, or to any other factor that would need a technical, physical modification.. and as such, could not be fixed by a simple soft/firm-ware "update". Who said electrical=VRM capability?
3) while i wouldn't like this either, what i need remind is that they promised AM4 support until 2020.. AM4 generally.. many ways to spin this and i never understood why/how so many folks were so certain it meant what they thought it meant. Hell, we don't even know if the big Ryzens (upcoming 12 and 16) can fit on an AM4 mobo.. there's physical dimensions, there's also the number of pins. Yes?
Let's wait a bit and find out
* as to the BIOS chips capacity, this has been explained and showcased to the outmost detail, i don't see who and why thought it necessary to bring it up again, but.. why not!