My first reaction is that wording like “codes within codes” and “redundancy” and “checksums” and “error corrections” are themselves either analogies or simply descriptive within their routine English definitions.
For example, there are no actual “literal” checksums within organisms! There may be processes which function comparably to checksums—but I would challenge anyone to tell me where the numbers serving as checksums appear in a typical genome, for example. (Now I would be the first to agree that anything which functions comparably to a checksum inside of an organism is an amazing and fascinating phenomenon—but that doesn’t mean that I accept that actual checksums are stored in DNA as unambiguous numeric quantifications.)