I’m not sure I’m parsing your fifth paragraph correctly. Are you suggesting Proxmox is DIY and unsuitable for Production? That Proxmox is suitable for Production and those who think they can roll their own hypervisor are in for a bad time? Something else?
Toss a message at Scott Reeder (Scott Prop and Roll). I’d bet money he either knows folks who worked that set or knows someone who knows someone. I’ve no idea if he’d respond but he seems chill like that.