“No, it also applies to double-action ‘automatic’ pistols.”
So you are saying “double-action ‘automatic’ pistols” have an external hammer which you can cock before each shot to get a lighter trigger pull but which is not automatically cocked when the gun is fired. What model of pistol is that?
Some do and some don’t. You don’t have to cock it with your thumb — in a double-action pistol, the first part of the trigger-pull cocks the pistol and the last part fires it. This means that (a) there is a long trigger pull, (b) the first part of the pull is a heavy pull to do the cocking, and this is the heavy pull that Yarmin was talking about in the OP.
Some auto pistols, both single and double, do have an external hammer you can cock if so inclined. And many revolvers do not have an external hammer, but use the first part of the trigger pull to cock it.