I don’t know. From your post it seems you weren’t aware of that meaning. If you are, my apology! :)
That's a shame. I've found his writings explaining theological ideas of Christianity in straightforward ways a God-send (pun intended). But as Lewis often advises in his works, "if you don't find the following [paragraph, section, etc.] useful or understandable, just skip it and move on," which I guess is what you're doing.