What do you mean except Ethereum? That coin was pumped the most so it will fall the most.. over time. At the beginning of the year Eth was trading at 12.00 then 4 months later its 390.00. Do you really think that a pump like that is sustainable? No.. back to the norm. It will likely settle below 100.00
I dont know why he do make exceptions on ETH and as you said its being pumped high together on some altcoins in the market and just as expected when correction happens then expected to go lower even more and the thing he said about that security blah blah things isnt really essential at all. We dont know whats the reason behind sudden decrease but its not really sensible to think about that attacks on the network. Theres no abnormal movement here mate.