Yes it is true, they always do it to make you feel panic, then afterwards you will sell all your tokens because you think the price of tokens decreasing but the thing is it is fake. For some reason they always do it to earn more tokens in lower price and they hoard it and wait until the price getting higher then they sell it to get a big amount of money. Just be aware of what happening it is important to know that many participants do it to gain more money.