So here's some results...
I ordered two of the splitters and received them in the mail today.
View attachment 109848
I decided to test both of these to see if they would indeed split.
To test it out, I used an ohmmeter to send current across the various ports. Unfortunately, the port side port (left 'OUT' port in the photo) was the only port that passed current. It would pass current IN to OUT and OUT to IN. I verified this by using a 20v SWM power inserter and again only power on the left side port. This occurred on both splitters.
So, I decided to take a peak under the hood of one of the splitters. Looking around, it appears like maybe the circuit for the right port wasn't completed (left side of splitter near the OUT port).
View attachment 109849
I'm no electronics expert, but it looks like the problem may be where the ohmmeter probe is pointing... It appears that the wire should be soldered instead of being free, maybe?
View attachment 109850
Bad soldering sounds plausible in my head, but then what are the chances two of these have the same issue? So, if the splitter has faulty soldering, then one from a good batch may work.