Actually, Telegram is an open standard which allows you or me to make a compatible app. Now, I am not sure if they are talking of such a client or an app that imitates to be one of these.

The article says it quite clear:

>"Predicio is present in twelve messenger apps, including apps masquerading as Telegram and WeChat. X-Mode is present in apps such as Messenger Go and Messenger Pro that mimic the branding of Facebook Messenger, with at least 60 million downloads."