There is no complete vacuum, that is correct. That would mean a pressure of 0 Pa, which is impossible. Even in outer space, the pressure is 10^-11 Pa.

Now ... the highest vacuum ever created artificially is around 10^-7 Pa. That is called UHV (ultra-high vacuum). It is far from what you can get in space (where the pressure is 10,000 times lower) but it is good enough for scientific experiments that require UHV - certain types of spectroscopy or particle accelerators.

If you don't believe in vacuum, or you doubt the experiments OP mentioned, you can do an experiment of your own in a vacuum chamber. Buy a drone from amazon, the cheapest one will do. Put it inside a vacuum oven (literally all chemistry labs have one) and make the drone levitate. Obviously it will fly. Now, turn on the vacuum pump on the oven and wait for the pump to evacuate all air from the oven (it has a pressure gage, you will see when the pump is done). The whole thing is as simple as flicking a switch. You can now safely turn off the pump (they're kind of noisy). Now try again to make the drone fly. It won't. It will stay on the bottom of your vacuum chamber.

Even better, if you think vacuum chambers have holes in the bottom to trick you, build your own vacuum chamber. It's really simple. You can find instructions online.