If you plan on keeping the ammeter in the dash nonfunctional and don't want to use a but splice connector, you could always put both ends on the same terminal.
I guess the only thing I don't get is the parallel with the old alternator wire (black) into the new red wire. Seems to me that would be like crossing two hots.
By using the two wires to power the accessories off of the factory welded splice, it's essentially just using the two factory wires to act as one larger wire. It's not really needed though.
