cryptocurrencies in this context is limited to altcoins only and it is very true. nobody can argue that altcoins are even currencies because they clearly are not. some of them are designed to be currencies but so far they have not achieved the goal of any kind of adoption which means they have failed to be a currency.

but since the article does not clarify this little but key difference i am going to call it FUD because bitcoin IS a currency and it not only is designed to be a currency but also it is adopted as a currency by millions of merchants online and offline all around the world and every month hundreds of millions of dollars worth of transactions are taking place for the sole purpose of buying stuff aka using bitcoin as a currency. you can check stats like what BitPay is releasing yearly.