Hi Paul,
To answer your question, they do say to wait till you have an interview date scheduled before doing the medical.
What's your approx case number. what I've learned the last few weeks is that if you haven't been contacted/scheduled for an interview, the chance of getting a green-card is basically 0 at this point. It will be a "too bad and tough luck" situation. Essentially they didn't actually start processing visas until Feb this year! Meaning they are so behind. With lockdown as well? They aren't going to be scheduling new interviews, considering they have a bunch postponed from July.
I looked into joining a lawsuit but it seems to be too late. I have looked into the Rosales vs Biden case (and read most of it) and they do have lawyers fighting to save the 2021 DV lottery and extend the 'expiry date'... but no final decisions yet.
I spoke to the lawyer, he basically said to not jump to any conclusions until the decision is ruled. But at least it put's into perspective that things are very, very delayed.
Anyone PLEASE correct me if I am wrong, this is just the conclusions I've made from what I've looked into recently.