Is a digital wallet created by blockchain?
The writer of that sentence did a poor job explaining things.

A blockchain (the data structure) does not create a wallet.  It is the data that a wallet uses to determine the state of the money it manages.  It is also the data that new transactions are appended to, thus changing that state, and wallets submit those transactions.

A blockchain does not create a wallet, but wallets do help to create a blockchain.