From what little I know, which is indeed little, these are not A-10 30 mm rounds that are fired off a hundred or so in a burst. Absolutely, 200K rounds would not seem to be very many if they’re being fired off 150-300 at a whack. These are more like Bushmaster rounds as fired from a Bradley, fired maybe 2 per second. You can see the gun firing in the video at the link.
Why either one would be considered “inaccurate and unreliable” I have no clue. I wouldn’t want to be at the pointy end of either one, thank you.
Both are 30mmx173mm cartridges, so they’d work in either gun.
Not the A-10 round, for sure.
(As a point of order, FYI. . .the A-10 GAU-8 has seven barrels, and when fired that can be 10-rounds per barrel per second, and that is 70 rounds in a second. . . .we don’t hold the trigger for more than a second because the heat generated by the A-10 30MM rounds melts/warps the barrels.)