That's very unlikely. The article is misleading in that the reporter seems to believe that emails / phone numbers are never exposed by Instagram. In fact "influencers" typically choose to set up an Instagram Business Profile containing email and / or phone number. So this is almost ceratinly public information that was scraped, not private information obtained via a breach. Assuming your "favorite celebrity" is a movie star, popular musician, etc, any contact info is very likely for their social media manager, not for them personally.