I know all of these things, and not sure why you are bringing it up.
They had to mostly halt Bolt production and for the last 6 month have produce very few EVs. I didn't say GM has never ever made an EV before.
But just go threw why saying 4th EV platform makes no sense.
EV1 wasn't a platform, and it wasn't even Li-Ion. It was just a low volume compliance car. It really wasn't a prototype except looking at it in retrospect.
The Volt is PHEV and can hardly be-considered an iteration of a BEV platform. Sure it gave them some experience with electrics but that is very different from a platform.
The Bolt was essentially LG conversion. LG did everything from cells, batteries, electronics including the 'infotainment' system. It really wasn't an EV platform as traditionally understood.
The Ultium is the first of what we might consider an actual BEV platform for GM.
And again non of that touches my central argument, they are miles behind Tesla. I don't think that is a remotely controversial thing to say to anybody interest in BEV.