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Notes -
This is entirely wrong btw, the US government has stealth satellites in orbit right now.
(Atomic Rockets is a great resource though).
The "stealth" satellites are not stealthy, their orbits are well known and their mass is roughly estimated. You can observe them yourself with rather modest equipment.
What is unknown is their capability and their mission.
Neither KH-11 nor Topaz are stealth satellites of the low-observable Misty line, although objects believed to be stealth satellites have been tracked by amateur astronomers.
Atomic Rockets (on the page you linked to) has a pretty good write-up by Matterbeam on stealth in space, but I recommend reading up on his treatment of a hydrogen streamer.
It's certainly true that, given sufficiently proliferated sensor technology, "there's no stealth in space." But it's also true that, given sufficiently proliferated sensor technology, there's no stealth anywhere, whether it's submarines or stealth aircraft. Keep in mind the question for stealth is not "can remain invisible at any arbitrary range," it is "can you disrupt the hostile kill chain enough to gain an advantage?"
In the real world, sensors aren't sufficiently proliferated, which is why there are submarines, stealth aircraft, and yes, stealth satellites.
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