a bunch of old ass siliconed up ladies, with no astronaut training

That’s because they’re not astronauts, they’re space tourists. You don’t need to train someone how to fly a rocket when the only machine they’re controlling is their seat belts.

No pressurized suits or helmets

That’s because the cabin remains pressurized and oxygenated.

And the door opened inward, as opposed to outwards like every other spacecraft or airplane designed to withstand that kind of pressure

That’s probably because they didn’t need to open the door in space, unlike almost every other spacecraft. It’s actually more secure to have it open inward when the pressure inside is higher than the pressure outside, since the pressure difference pushes the door closed rather than pushing it open.