I am unsure what your actual point is.
The adapter I refer to would be the common dual ide board that fits over the internal 2.5" header. As I don't have one now, I cannot include.
I made this cable so that I could hook up externally positioned cased drives , and quickly remove them if I needed to transport the Amiga. It made good sense to me.
It is a cable specific to my particular needs at the time - how you set up your cabling is your own business. I am not twisting anyones arm to buy it. I am simply clearing out things that I will otherwise consign to the bin.
I fail to see what amuses you, so.