Ah yes, the interlock doors. Arguably the least impressive demo so far. We are informed they "basically close 95% of the way within 30 ms", which is about 2 frames of 60 fps YouTube video. It looks like this is actually kinda correct, but the thing is still flopping around, reverberating and unsealed, for another 100 ms or so. They will have the advantage of atmosphere pushing down on it when there's an actual pressure differential, to be fair. If they install it correctly.

If I (generously) assume a 20 meter length between interlocks, and Mach 6, 6 * 343 m/s ~ 2000 m/s, I end up getting a transit time of 10 ms for the ballistic. So at this stage of development, yep, the doors will be open at the same time, for the majority of the time they're open.

Here's one major overarching issue: When you instantaneously expose a volume at vacuum to a volume at pressure, you should treat it like a shock, using fluid mechanics. I think they are making a major mistake in thinking that the tunnel length is long enough that the atmosphere, presumably traveling at mach 1, won't have time to reach the chamber in 30 ms. Shocks can propagate well above the speed of sound, indeed, some shocks are of course caused by a bulk/fluid flow traveling faster than the sound speed. I'm not sure about this instance, I'm hoping to find some time later today to do the math. OH, not to mention, the sound speed is much higher in a vacuum. None of that's actually not the real problem, though. The problem is that shocks are non-linear. They could have a day of successful launches, and then the next day, a 7 mph cross-breeze seeds a micro-instability across the outer interlock that balloons into a disturbance that destroys the entire facility. But if you're intent on gambling with the butterfly effect (no tag! hah)? You're gonna want your geometry as symmetric as possible, like a perfectly cylindrical tunnel, in this case, and I just... I dunno. They might not know that. Should we mail in weekly suggestion letters? (no)

a capacitor BARELY BENDS OVER in 10,000gs

This was so funny, because he goes "it's just a bit of mass held onto the board by, y'know, steel", and I'm stuck wondering if they fucking welded components onto a circuit board, or the guy doesn't know that solder is made of tin and lead. Whatever. I can assure you that the reaction wheels weigh both too much and not enough, depending on which problem you're talking about.

Both options of "slamming the counterweight into an armored wall inside a vacuum chamber" and "re-opening the interlock doors for the counterweight ~ 100 ms later" have had me in stitches multiple times over the last few months.

They're doomed. And they know it. It's their grift.