this prediction basically is just speculation but based on some past bitcoin chart or some technical analysis, I see nothing wrong with this
Correct. The prediction doesn't guarantee anything, it can be true or wrong. However, it is not guessing in a random way, it has a certain method/approach. Regarding Bitcoin possibly reach $288K, it is purely a prediction. Nothing wrong if it cannot be achieved at the end of this year. That's why even an expert stated the prediction, we shouldn't thoroughly trust him.
This is why it is called "prediction" and not information, like for example tomorrow will be 20th is information, it is still about the future, you do not have to be a wizard to say some guaranteed information about the future, like I will die, that is about the future and I am not a wizard and yet it is guaranteed thing about the future.
But when you say something, like 288k will be this year, 80k will be this year, whatever you say, it is not going to be that guaranteed for sure, it is prediction and that is why we use that word. I have my own prediction for example, I am expecting at least 100k this year, could be more could be less, I can't know what will happen but I "predict" that it will be over 100k. There is nothing wrong with predicting something, keep doing that and you will eventually get it right and make some money from it at same time.