At the end of the day it’s just a guess. No matter how much study and research you do to make the guess, it’s impossible to predict accurately. I have been following bitcoins from many years. I have seen Bitcoins follow a 4 year cycle to reach ATH price. Now as the ATH price is achieved, hence some correction in the price is expected. Hence, I am assuming Bitcoins will lie in 65k usd range at the end of this beautiful year.
Just like what you said, in the end it will just be a guess, no matter what kind of analysis it will not prove its accuracy, because we will not know what the future will be like, the $65k figure you said is also just an assumption that you rounded up the calculation, right? and even that is not necessarily accurate because of the volatile nature of the price of bitcoin.
So there is no need to criticize other people's opinions if you do the same thing as what he did, everyone has the right to say whatever is on his mind and express it, right?