It was ‘dark’ but for all of the logical reasons. Hillary is running for a full throated Obama third term. Next week’s dems convention will be a defense of the 8 years of this administration and will basically break into two categories:
1. It’s sunshine, lollipops and rainbows in this country and we must continue on
2. Those racists, xenophobes want to stop our progress and we must not let that happen
Trump just reminded the american people that they know full well that a lot isn’t well with this country because of this administration policies, we live in dangerous times and to continue on with Hillary is madness. Let’s make America great again
I don't think that was what was meant. It was dark, not in mood or tone, but in the sense that it was "hidden", as emphasized by the transcript highlighting the deviations from the previously released transcript, which were largely if not completely innocuous.
This is what we're in for, folks.