Yeah. We've had systems that could do this (Deceptive ECM)since the 70’s, maybe earlier. The term “stealth” is very broad. We couldn't use a repeater to make a platform invisible but we could move it's position (RGPO range gate pull off). Very handy in anti-ship missile defense.
The plane was shot down by a space based laser. Could have been ours and we were sending a message to China to not try anything while we deal with Russia. Could have been the Russians and they were sending a message to us that if we want a we in Ukraine, have at it. Or it could have been China’s and they were sending us a message saying we no longer own space and boo freakin hoo. Thats what happens when you shut down your space program.
It’s as good a theory as any.