Meryl Streep has two acting Emmy awards to Davis' one. It's a pretty negligible comparison.
How to Get Away with Murder is a shitty show. That doesn't negative Davis' talent within the show.
Streep has been in massive successes true. But that's kind of the point Davis is making. If she's on that level of acting talent, or at least right there, why is she not making that money? Why is she not getting those roles. She's not a newcomer to acting, she's been at this a while. You've never hear anything negative about her behind the scenes, at awards shows, nothing. So it can't be her being blackballed.
You are ignoring the part about the other awards mentioned in that post.