You said it twice already, but that doesn't make it correct. See QRH, most likely p 4.11.
Our CI is also less than LRC.
Yours,
FD (the un-real)
Indeed - that is an approximation of an approximation (which is a weight/FL/CI graph).
But surely when most people say LRC they mean what Airbus call MRC. Which is, of course, CI 0.