Of course you can't, they're just guessing. If anyone can guess the future price then they're just guessing, I've read a tweet made in 2014 that 2024 price will be $100k, of course if we were in 2014 when the price was around $300 would laugh and think he's crazy, but now everything that is guessed might happen, but guessing the future price is of course something that anyone can do.
Everyone has their own way and knowledge of speculating on cryptocurrency prices that they are familiar with before. But for this I would not say that everyone is just guessing because maybe they have used a little knowledge to make their speculations at this point even though it won't be one hundred percent correct.
But when some people are speculating for $100K and what happened at that time was $300K, it could actually also be an extraordinary speculation even though the price has exceeded what they said, but what makes some people feel tired of this is when the price what was speculated did not happen and even tends to be smaller than what they said in the past.