Market sentiment is changing and Bitcoin is always associated with volatility, so it is difficult to say in this process that only holding it for the long term will yield profits or maybe it's not even possible to say depending on how much Bitcoin you've accumulated and how long you've held it. Holding for the long term is definitely a broad-mindedness for investing but if you have enough Bitcoin and are aware of the market situation there may be a chance to make a profit, because of the rapid rise and fall of the market even if you have a portfolio full of Bitcoin no distinguished investor can guarantee a profit.
Try not to be confused about Bitcoin, you are a senior member, I expected you to know better that the way Bitcoin is wired, it is more beneficial to hold a little bit longer because since Bitcoin is an asset that appreciate in value overtime even common sense will make us understand that as time passes by, it value is going to increase and you that is holding it, is going to make more money.
There is no guarantee on this, although bitcoin is the best digital investment if not the best investment presently, but we must remember that we are not guaranteed any profits in bitcoin. We are only having a fair bet on bitcoin by choosing to believe in it, accumulate and hold for a longer term, which is Ideal for bitcoin investment, yet it doesn't change the fact that we are not guaranteed profits which IMO is what the guy you quoted is trying to imply.
There's no guarantee if we invest targeting profits for just a few years, but if we invest for the long term, there is a guarantee; you just need to persevere with strong patience. Sometimes we have to align information about Bitcoin with belief. This means that if you know Bitcoin is the best digital asset, you also need to believe that Bitcoin is a long-term asset that will lead us to financial freedom someday.
Because if your belief is not there, you'll inevitably hesitate to buy Bitcoin. You might buy Bitcoin, but when it drops sharply, you'll inevitably sell it because you lacked belief (no guarantee). Even if there's no guarantee, as you say, that's why it's important to invest with money you can afford to lose. I believe that confidence is crucial for long term investing, as it's a mindset that keeps us from panicking when the market fluctuates or when bad news about Bitcoin comes out that makes you think there's no guarantee. Believe me, Bitcoin experiences bad news almost every year, and even several times it was predicted to die, but what's happening now is the opposite.