The volume on that day was because the stock hit a pivot point...

The volume on that day was because the stock hit a pivot point and part of that would have been automated buying by a black box trading platform along with chart entry traders, perfectly normal. If the stock had drifted below that point then with any delivery of news chances are that the support point would have become the resistance point which would have stagnated any potential rise/momentum. I suspect that the broker is orchestrating the stock chart for further gains without encumbrance or further need to backtest. Hope this helps.