Good investor can get much profit, without earn money with bitcoin investment you are not good an investor, but become how to be good investor is not easy, you have learn first before which altcoin do you want to buy, you have know is good altcoin for buying right now or not and you have can control or manage your profit with your investment.
I don't know what are you trying to point out, if it is about earning money with bitcoin investment or making profit with altcoins.
I also don't know if you agree or not, but it looks like you agree on what he said.
Nevertheless, being a good investor doesn't need to just make profit with cryptocurrency because a good investor can identify different opportunities in different fields because of his knowledge in investing and also the self discipline that he has as an investor.
I'll take this as a yes, by identifying different opportunities in different field, an investor could make profits. All people who invested their money in cryptocurrency is a good investor to me, what made them a worst one is they lack in faith, knowledge, my simple analogy for that is they just took a lion as a pet and they though they could tame it but it kills them in the end.