"Eye(I) chan(g)ed my sig!!!etc..." was always my guess.
On the other hand, (a.) one would
have to dig pretty far back into the archives to even see R.L.
's sig before this point; (b.) he wasn't really around to try to correct; and (c.) the continual misspelling of his username is the far more distracting thing one tends to notice when coming across a post of his.