Yes, this is true, you never lose any amount in your holdings if you do not sell in low.
just keep holding and make your self-comfortable in waiting for the Bull season.
we will get into that soon.
Your understanding of this is very limited and fundamentally flawed. By holding in a prolonged bear market you're not literally losing money but purchasing power because your coins are losing value. People are saying to hold and never sell at a loss because they believe in BTC and that this bear market is only temporary. That's what I believe too, but holding doesn't make you safer or smarter than the rest. What if the market keeps declining and right before it's about to recover something bad happens, like another blockchain bottleneck or a series of hacks? You'll end up waiting another 5-10 years for a recovery.