Yeah doesn’t say where they got that information and it also adds a note at the end that she’s an Independent. So a Republican is both not in charge of endorsements and there is no evidence that endorsements are delegated to her in the first instance.

EDIT: Some more information fully debunking your claim. In your words later in this comment thread you stated that the person who has been delegated the local WaPo political endorsements is “Jo-Ann Armao is the editor covering local politics.”

The woman in question penned an article defending Planned Parenthood in 2015: https://www.washingtonpost.com/blogs/post-partisan/wp/2015/07/15/dont-rush-to-judge-planned-parenthood/ .

And also voted for Hillary Clinton: https://www.washingtonpost.com/blogs/post-partisan/wp/2016/11/08/win-or-lose-clinton-has-done-something-remarkable/ . So yeah, not a Republican.