Like you said people that diversify are traders also a lot of people get into trading because they see people going into since to them it is less risky and profitable without them having full ideas or understanding trading and that is why they lose all their resources. Some persons have not finished managing or even having full idea of their holdings properly and they are talking about diversifying this is why businesses/investments crash.
I will say a big No to that, that a pathetic statement in my own opinion, if I have accumulated more than enough Bitcoin today and I feels like I have gotten up to my accumulation goal, then I decide to invest in other asset like land and real estate, does that makes me a trader?
Just think about that statement once again, how does that statement sounds to you?
Take note that the key thing that makes us invest in the first place is to secure our future financially, so if you have over accumulated Bitcoin and you decide to invest in other real life asset it doesn't makes you a trader, but an investor trying to solidify his or her future financially.