I think it is true, however we all have different reasons and perspectives, and in my opinion, if someone has a lot of money, there is nothing wrong for them to invest heavily during a price drop. For some people, having a DCA strategy is to stabilize their finances so that they are not disrupted by investments, and I have it for that reason.
The most important thing is the initial planning that we have set if this investment is intended for the long term, regardless of whatever strategy we use to accumulate Bitcoin.
Furthermore situations like this often lead to people being underestimated or belittled by others. Sometimes an individual may wish to invest on a massive scale yet they feel inhibited—primarily due to the scrutiny of others who critically label their actions as wasteful spending. Consequently the individual may ultimately scale back their approach to something more modest—investing only moderate amounts—rather than proceeding with their initially ambitious plans. They do this simply to mitigate the negative reactions of those who frequently cast judgment upon them. Ironically the very actions this individual wishes to undertake could serve as an inspiration to the rest of us—demonstrating what is possible once we achieve a healthy financial standing thereby encouraging us to pursue similar investment goals. Yet there are those who harbor envy toward anyone investing such large sums such is the nature of humanity today—when others perceive that someone possesses "more" than they do negative remarks inevitably follow.
As an investor, the first thing you must avoid is greed and another thing you should understand is how to sort the advice you receive from people. Some may give you advice based on their kind heart while others could advise you wrongly from their envious minds. Hence, this is one of the reasons why every investor is supposed to treat his investments as confidential in order to make the best out of it. As a person with a set goal, you already know the advice that you should avoid, any advice that is contrary to a long-term plan you should reject it. Again, any advice that would push you into investing beyond your financial strength should also be avoided.
A person can invest by lump-sum at any point in time as long as he invests from his Discretionary income as long as he is ready to hold for a long-term. There's no point holding back your money just because you think that you need to wait and buy cheaper. I feel that if actually you want to invest in bitcoin, you can invest when you are ready to hold and treat every bitcoin price as Dip always.