When it comes to Bitcoin investment there is nothing like been late and anyone who is using that terminology is either deceiving himself or herself or not serious to invest because someone who is actually interested won't look at been late or not since they will consider the DCA method and holding for a long period of time. Again, it is not even about starting early because there is a possibility that someone who start investing now can grow his or her portfolio more than someone who started some years before them depending on their capacity, it is only a wise and serious investor will understand this.
From some perspectives, it may not be a bad idea to delay, but from another perspective, it is never a good idea to delay investing. For example, there are many people who have basic knowledge about Bitcoin and have discretionary income, and it would be very foolish for them to delay investing. If a person has basic knowledge about Bitcoin and if they have discretionary income to invest, then if they do not invest, they may be falling far behind in achieving their goals.
If a person is not aware of Bitcoin and does not know what Bitcoin is and what it does, then the situation is very different for them. But for a person who knows about Bitcoin and is interested in investing but is not investing, this will not be the right approach at all.