Holding is obviously not the same as investing using DCA methods, it's even better to compare holding to trading because that's where people normally make mistake from but comparing holding to the DCA methods of bitcoin accumulation is just same as saying that winning the world cup is just same as participating in the world cup tournament.
Trading and DCA has nothing in common DCA is a process used in accumulating bitcoin and most of the people who use DCA process are those who want to buy and hold for long time so I don’t see anything wrong with saying DCA has something to do with bitcoin holding. But for bitcoin trading you don’t need to follow DCA at all you just need to use the money you have at hand enter the market and start their trading losing or winning, so i don’t see any relation between DCAing and trading that’s a wrong connection if you ask me.