They can say such things because they do not know that the btc price has now increased, according to them the price of btc will continue to decline so it can be said that way.
I don't think they don't know about the increase of the Bitcoin price. They know about the price and this is sort of a tool they try to decrease the Bitcoin price with such arguments so that the users start panic selling at the exchanges. I don't know what their aim is? They are interested to make the prices lower and make a bad image of the Bitcoin but I don't think it is going to work for them. Yes, most likely it's competitors who try with false rumors to reduce the price of bitcoin and destroy it, but it is too strong to succumb to such rumors. The price is rising rapidly.