I think the point of the original post was that the economies around the word are slowing down and to sell but not necessarily sell bitcoin. At least I take it that way. To me, if the dollar gets weaker and stocks drop in value, then maybe it's a good time to invest in crypto currencies instead.
Yeah, investing in crypto seems to be good at a moment, as we can expect much higher price in the future, and if they are saying to sell all bitcoins, then not the right time to do it, we need to wait for next couple of months.
nothing is guaranteed, bitcoin doesn't guarantee you success in long run, as we don't know where bitcoin will land in future, but if you hold bitcoin at a moment then just hold it for next couple of months.