Which is indicative of... squat. They could introduce an RSA-authenticated backdoor at any time, not unlike the one we had seen in xz, & no researcher would ever find out. In fact, chances are it's already there but even if it's not, Qubes is locking you into Xen platform regardless. The only viable means of gaining security against the NSA is full-source bootstrap from commodity FPGAs. Yes, you'll be stuck at 50 MHz for the time being but at least you know a backdoor-in-synthesis is so much more intractable. The physical surface area to protect is much smaller, too.