The article states in relevant part:
Bitcoin is down 58% in three months and down 66% from its all-time high. Most cryptocurrencies have shed even more since January, but a few have outperformed bitcoin. The handful that are in the green, such as ontology (up 110%) are only up because they weren’t introduced until 2018 was well under way. Had ontology, which was airdropped to NEO holders, been launched last year, there’s every likelihood it too would be in the red. . .
On the balance of probability, if you’d attempted to counteract bitcoin’s decline by switching to altcoins, you’d have lost, and lost heavily. Ripple and cardano are down 84% in three months, and NEM has fallen further still.