That post was written when BTC was down by more than 60% from USD 1180,-. Right now we're down by maybe 25%.
In the bear market as a whole, the value dropped from $1180 to below $200. $1180 to $200 is a reduction of roughly 83%, so you would be losing more than four fifths of your coins' value if you held throughout that period. In some BTC bear markets it's been even worse.
The trick is putting your coins (the ones that you're not using regularly) in cold storage somewhere that it would take a while to access them, so it takes a lot of thought to dump them and it's not subject to short-term emotions from price movements.
If you have enough savings that you can still live comfortably if you lose all the coins, HODLing shouldn't be too difficult.
I'm just going to hold and ride it out. That drop to $200 was a few years ago and I think Bitcoin has a bunch of new investors since then. Hopefully they won't all panic sell to make the price drop 83%. I guess less than a 50% drop from peak price.
If it drops below $3000 I might regret that I didn't sell but the hard thing is that we didn't know if the price would go to $7000 before a correction even though we knew a drop would eventually come. It's too hard to predict sometimes but I see the drop as a chance to buy more Bitcoins if it does go below $3000.