It's also not entirely true to say that every time is the right time to buy bitcoin. You cannot advise someone to buy bitcoin when it hit $69k last year or someone to buy when bitcoin is $100k in the future. You won't lose even if you buy at that price as long as you don't sell it, but it's a bad investment method because it will take you a long time to break even while someone else will make a big profit at the same time. Buying bitcoins requires the right time, and finding that moment depends on each person's skill.
The highlighted (by me) part is a myth. It's true maybe for the purpose of your tax returns but otherwise is simply wrong. Whether you make a profit or loss should be considered in terms of value (i.e. expressed in fiat currency) and not only by the actual fiat currency that you have.
If you hold $100k worth of bitcoins and the next day it's worth only $50k, that means you got poorer and lost 50% of the value. Whether you sell or not is irrelevant. The value of the assets you hold is now lesser than it was, and pretending this is somehow not a loss is just a cope.