I can confirm this audio extractor has solved my green screen issues.
Having previously tried a HDMI splitter (one in two out) that did NOT work I was skeptical.
But seems to have solved it for me at least so might be worth a try.
Good luck if you decide to give it a try.
The one you got from Amazon does appear to be the same unit as mine but I suppose there could be a slight spec difference or maybe even a fault with yours.