Is it bad to use Auto Gold ATF DM in a transmission that only requires Dexron VI

I'm not sure I'm understanding your question? You are stating you used an ATF which specifically states not to use in a transmission which normally uses DEXRON VI and you're asking if that's a bad thing? If that's the gist of your question, then, YES IT'S A VERY BAD THING. If you haven't ran the transmission, get it drained without running it and put DEXRON back into it. If you've ran it, you'll at a minimum need to have the transmission flushed, then have DEXRON VI added back in. Then there's no promise you haven't done damage to the transmission already. Only time will tell, but chances are pretty good you have done damage.