Yeah we still don't know if this theory contains a kernel of truth or not.
But on DMM i rolled all of my 7 Silver/Bronze Pots at around 08:00 pm. In this case i think the theory somewhat proves that rolling at specific times is just awfull.
Maybe it has something to do with your IP or Nutaku/DMM ID and some timespans are programmed to be good or bad...
On the other Hand i also rolled semi bad rolls at timespans i thought were good.
The only thing i know: i won't roll at 08:00 pm anymore...
There is also a rumour that rolling at the beginning/end of the month will grant you better results (himeuta forum)...Don't know if it's true...