Why do posted EXIF not show camera model?

Detail Man wrote:

As I understand it, DPR seperately re-samples and re-encodes the JPG versions of the uploaded Original JPGs. This is clear because the "Large", "Medium", and "Small" versions have a sRGB ICC Color Profile within their image-file meta-data - whereas the in-post displayed JPGs do not.

Further, if the in-post displayed JPGs are being generated from anything other than the Original uploaded JPG, that would mean that (after whatever Chroma Sub-sampling has been applied to the Original uploaded JPG in it's encoding), the Original image is redundantly being (2x2) Chroma-Sub-sampling twice in the DPR JPEG re-encoding processes.