The fact that they can come out and say this demonstrates that these employees, the people best able to assess this, don't believe that Eich will retaliate. That Mozilla is and remains a place where any employee can express their views on political issues, even if they know they're contrary to the CEO's. And that destroys any argument for Eich's role as CEO creating a conflict with Mozilla's ability to welcome LGBTQ…
When you speak in public, it's possible that you will face censure from your employers, your employees, or your customers. You can't control how other people feel about what your actions.