it is also wrong.

"digital" currencies are any currencies that don't have a physical form or are used digitally. your paypal account, your bitcoin wallet, maybe even your credit cards can be categorized as digital currencies.

"crypto" currencies are any currency that is based on cryptography. it can be centralized or decentralized. the main defining factor is the cryptography not the open/closed or de/centralized state of it.
example: both bitcoin and petro are cryptocurrencies but bitcoin is open source and decentralized while petro is government made, closed source and centralized.

all cryptocurrencies are digital currencies too.

ps. when you plagiarize try to find a better source next time!