People who post to drama sites routinely take screenshots of tweets and posts from other sites because it's an easy way to have permanence even in the face of hostile moderation. This will just extend to normal journalists now.
There are tons of subreddits that are devoted to catching some person or another with questionable tastes or interests in saying something they shouldn't. In these instances, rather than linking to the post (which may result in a moderator taking it down or the poster realizing how badly they're being dragged), they instead take a screenshot since it's a bulletproof way to retain the content.