But this information might change participators' choices again, how should we adjust our strategy according to this kind of information?
If the same group contains people who trade regularly then they will be making decisions based on predictions. Because the ones who find it bogus (the better informed group in reality) will have already left than group and set up their own predictions.
But honestly speaking, you should not focus on such groups and channels. Because the owners are known to pump and dump shitcoins because they own them and they will be selling while the rest of the members are buying them. It is a type of a scam but you cannot do anything legal about it except separate yourself away from it.
I would call it "mis/dis-information" more often. Crypto is full of such groups. Dont fall prey of them. Learn to read the charts and try dummy trading on your own first and then start trading yourself.