Here's the cheat-sheet for making these cables that I put together some time ago:
MALE PORT FEMALE PLUG
( 1 2 3 4 5 ) ( 5 4 3 2 1 )
\ 6 7 8 9 / \ 9 8 7 6 /
Mapping for converter for plugging an Intellivision flashback controller into an Intellivision
Socket (M) end -> Plug (F) end
Your mapping doesn't look like a simple reversal, something else went wrong there. This is the mapping layout I use when I make the adapter cables. And yes, for anyone reading here who has requested a set from me, I am behind -- I got seriously sick in December and am still recovering. I'll be making adapters soon for the handful of orders that have been sent my way...
Encouraging to see others in the community attempting to make these on their own, however! It's an "open source" kind of hardware thingy...
I just took another look at Paul's video and his naming of pin-to-pin is very different than the diagram I posted above. mr_me's posting of three pin mappings agrees with my list, and I know I've used this diagram and list to make these cables before.
I think I see the mistake Paul was making in the video. He was treating both ends of the cable as if they were numbered identically -- using the Socket (M) side numbers for the pins on both sides. E.g. his first connection he describes as pin 1->2. The actual connection should be M pin 1 to F pin 4. He's basically saying "row 1, 1st column on the socket side to row 1, 2nd column on the plug side as you look at them end-on".