Wouldn't it be more useful to examine the stock and options markets for evidence of time travel? If I had a time machine, I would almost certainly try to use it for personal profit with maximum secrecy, rather than giving myself away by blathering about the future over Twitter.

Also, the study does not rule out Back to the Future style time travel, Terminator style travel, or Primer style traveler isolation protocols. Nor does it rule out multiple universe theories, such that future events become unpredictable to a past-traveler within a very short period of time due to the butterfly effect.