Sure some traders don't know that they are traders. Some traders call themselves investors, even though they are not investors.
Exactly, you're right. I believe this is the reason why when they are into their trading practices like buying and hodli for few months or 1-3yrs, they sell when they are in profit. Hoping to buy back when the price falls. Many forum members here also are traders unknown to them, because if you ask them when is the best time to buy bitcoin, they'll say buy in the bear market and sell in the bull run. They will argue with you till infinity that they are not practicing trading, if you tell them. Instead, they'll say that they are investing.