It would be odd if the price would drop considerably or stay about the same some time after the halving (say... 10 months afterwards). I think that the article is flawed in saying that the expected rise in price is because of reduction in the circulating bitcoin. That is wrong. Right now, there is a production of bitcoin, some part of which needs to be sold off to pay for mining cost (electricity bills cant really be paid in bitcoin). They have to sell, and that sale pressure holds the price down somewhat. Once the production of bitcoin goes down, that sale pressure will be less, because they'll have only half the available bitcoin to sell for the cost of mining. Those producing bitcoin will have to sell at about double the price if they want the same profit (assuming the cost of mining doesn't really go up). The only way is up after the halving. Maybe not immediately, but I'm pretty sure the price will double (from what the price will be at about the halving), in about a year after the halving.
They will have to sell. Since their earnings will be twice as less (without any economic reason behind) while they still have to pay the same bills, they will have to sell more. Most likely, much more, thereby emptying their stashes. I don't see how the price could double in these circumstances...
So, I'm afraid, the sell pressure may actually increase