Correction is always a positive thing, yes for some people in the moment of going it is not, but be patient for the time. After that everything changed: price, popularity, taxes. These small thing that in general, gives you the picture of situation!
That post was written when the price of bitcoin was at the peak and it happened which we all saw and now there will not be any other bigger correction. The current up and down is the normal fluctuation in the price of bitcoin which will continue for sometime and after some time the price of bitcoin will again start to increase and again we will see another ATH in the price of bitcoin.
You are right that the original post was made when bitcoin price was very high but that also means that the poster's prediction has come to pass too. Also I do not know if this continuous fall is normal or not. It now is scary to me that bitcoin is red this day with nothing major to pull it up. It can still go down if we are still thinking it is correction.