CAT is the definition of specs that the cable should meet. All this other crap is being hopeful that will they make more money.CAT has nothing to do with power carrying ability. It could be untwisted and carry plenty of voltage/current if the proper thickness.
In CCA the aluminum carries no power whatsoever, it is simply a structure for the copper to sit on. Skin effect means the electricity passes only on the outside, which is where the copper is, that is the whole reason for CCA. The disadvantages of CCA are that the copper can wear off (an issue for coax that is plugged/unplugged a lot, not an issue for ethernet as the concoctors are not exposed to any wear) and that frequent bending can cause cracking more quickly, but who is regularly flexing an ethernet cable at sharp angles?
I don't want CCA cable regardless. They seem to hide that fact their cable is CCA.