Landis discussed DUG's components making the point it's important to know what's in the index you're trading. But the original post also mentioned EEV and FXP so I think it was more about the more overarching misconception that leveraged short ETFs are longer term trading vehicles when in fact they seek daily results.
Quote from chrismontez:
I think the original poster on this was addressing a misconception many of us had. When I was looking to take advantage of what I thought would be a drop in in oil from $135 I bought DUG at $27.50 as I had read several articles recommending it as a " safe" play on a drop in oil prices for those not wanting to short oil futures. I got out shortly after with a slight profit as I soon realized my mistake after watching it's correlation to energy stocks more than oil. Kicked myself in the arse when it ran up another 100%, but .... that's trading. DIG / DUG is not a play on oil.
).