utter nonsense. Any trader just pick 30-40 recent Buy Out or Partnerships and see price before the announcement. It has no correlation - meaning it never has upward trend because of M&A.
In short, price will not move up if M&A isn't announced/there is no leak.
Reading into short term price fluctuations will give a trader the same insight if you just read coffee stains off your cup.
Just use ENTL, bought today, as an example. It didn't run. So far you're 0/1. You got any examples that actually back up your assertion? I won't hold my breath.