My advice to all altcoins investors is not to panic ,these people as popular as they are can't predict the future, last bullrun of 2017 no one saw it coming and the last Almighty altcoins season of January 2018 no one ever think that will happened.
Be careful when you choose an investment in altcoins, maybe that was addressed by the article you read.
Pump and dump always been happened in altcoin price and this way can attract a newcomer especially new investor to choose investment in altcoin.
There is some altcoin which can be avoided from pump and dump scheme such as ETH or the coin which is in the top position.
I doubt the alt season will comes, since almost the altcoin price now still following bitcoin price movement.