Does this mean Target's twitter was successfully attacked?

Yes, Target did have their account hacked. In fact, quite a lot of verified account holders have been hacked to further this scam. The scammers do this to impersonate other accounts, including Elon Musk's, by changing their name while retaining their verified status. In this case, it just looks like the scammer is using Target's account directly. This scam has made the hackers over $150,000.

The Elon Musk scam is the most well-known now, but it appears Target was caught as well.

Target has since confirmed my suspicion:

Hard Fork article

“Early this morning, Target’s Twitter account was inappropriately accessed” a company spokesperson told Hard Fork in an email. “The access lasted for approximately half an hour and one fake tweet was posted during that time about a Bitcoin scam.”

“We’re in close contact with Twitter, have deleted the tweet and have locked the account while we investigate further,” the retail giant further told Hard Fork. Unfortunately, the origin of the breach remains unclear.

Other reports of the incident include:

• USA Today

• The Next Wev

• ZyCrypto

• CryptoNews