Regretfully, your suggestion does not help. All that modifier does is tell you whether the CAPS LOCK key is currently physically depressed. It does absolutely nothing to tell me if the CAPS LOCK green light is on. Nobody uses CAPS LOCK as a SHIFT key, they use it only for its ability to change a flag in macOS, and the state of the flag can be seen in the little green light that appears on the CAPS LOCK key. As a result I could not use that code to "check the status of the CAPS LOCK flag" which was the requirement that I stated in my original question.
The modifier condition in KM does not tell you the state of macOS's internal CAPS LOCK state, it tells you only whether the CAPS LOCK key is currently being pressed down, which for my purposes is useless.
I searched the internet again to see if there was a way to find out the state with a macOS command. And this time I found one. However it requires that xQuartz be installed. For some reason I can't recall, I have that installed. The command is "xset -q". The first time I ran that command it took about 15 seconds to return a value. Subsequent calls took between 0.1 and 0.5 seconds each. So it's a bit slow, but it works.
To reiterate, the KM modifier condition tests only the current state of depression of the CAPS LOCK key, which does not solve my problem. If I'm depressing the key when the green light is off, it returns true. If I'm pressing the key when the green light is on, it returns true. And if the CAPS LOCK key is not depressed it returns false irrespective of the state of the green light. My programs require knowledge of the green light so KM will not help me at all.