Here is my opinion of this topic. Take it as you will.

Is Noah Kravitz continuing to use the same Twitter handle listed in the article? If he is no longer employed by the company, he I believe he needs to drop the company name or anything else relating to the company, from the account since he does not represent them any longer.

Also, I believe it is up to a Twitter users followers whether they will continue to associate with a Twitter user in these scenarios. They are free to follow whom they want.

Businesses that are confident in what they do, do not lose much sleep over things like this.