Not working, at least with my Epson 5025UB. Tested both 3D ISO's and MVC MKV's, via AVR, and just to make certain, Shield to projector directly...
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Looks like Koying is experimenting by forcing 3D MVC into TAB mode output, but as w/MVC builds for AMLogic to date, output is either TAB/HOU, 2D mode or blank screen/nothing. If TAB/HOU, my projector doesn't automatically go into 3D mode as it does with actual TAB MKV's via Raspberry Pi 2/3 for example. I can force my PJ w/AML boxes to TAB and get a 3D picture, but render is half-rez, not full frame-packed. VidOn, which has managed to trigger 3D automatically on AML boxes, also renders half-rez. I know as my projector clearly indicates "Top and Bottom" for all 3D ISO's vs. the proper "Frame Packing". Also, if you look at the picture close-up, the resolution/detail isn't there as w/full 3D render.
For the German forum poster, if you can reply to him, I'd suggest you suggest he check the info panel on his display to verify if signal is "Frame Packing". I'm guessing it's TAB, with his display more sensitive than mine in automatically engaging 3D mode. And, TAB render will likely be best we can get until Koying or other devs have access to Shield's MVC decoder for proper 3D. But, Koying is best to explain here.