I personally do not know any member of the Church of Jesus Christ of Latter-day Saints (the LDS or "Mormon" church) who claims to be a non-Christian. However, I do not know all members of the LDS church or their claims.
Instead of "usually" I might have said something like "without exception that I know of," but that seems a bit cumbersome.
I just found it odd.......
It's like when people say..."I'm going to be honest with you!" I think....ummmm, you mean you haven't been?
fwiw-