There are both semi-automatics and revolvers that fire the .45 ACP (Automatic Colt Pistol) round, and both semi-autos and revolvers that fire the 9mm round. And http://www.gunsholstersandgear.com/2009/01/03/smith-and-wesson-model-310-night-guard-revolver-in-10mm-and-40-sw/ is a Smith & Wesson revolver that fires 10mm.
I think he's thinking about the fact that revolver rounds are rimmed so they sit in the cylinder better, whereas auto rounds are not.
That doesn't mean that rimmed rounds can't be used in an auto pistol, and vice versa. You just have to go about it a certain way(for example you must use what's called a moon clip for non-rimmed calibers in revolvers.) His mistake was in thinking that you cannot use rimmed rounds in an auto pistol ever, so they must make "special" versions of rimmed rounds for auto pistols in that caliber.
They do make "special" versions for revolvers, especially for the .45 you mentioned, as the standard .45ACP cartridges are very difficult to use without a moon clip, and can even be problematic with the moon clip. They make what's called "auto rim" ammunition, which basically just turns the .45 into a rimmed cartridge.
Now here's where it get's tricky, due to the tolerances of most .45 auto pistols, I don't think they'd be able to use auto rim ammo. However, your desert eagle .44 is specifically designed so that it can fire the rimmed .44 mag ammunition.
So in conclusion, he's sort of right. Generally, revolver ammo is rimmed and auto ammo is not. However, there are loopholes and workarounds, and as with anything mechanical, if you have the drive, the ingenuity, and a little piece of metal to work with, you can make anything work, even in a way it's not supposed to.