Well, according to the site, they will contact you once the SDK is available again. (I don’t know, who knows when?)
So, maybe the message you entered got through to them, but you’ll have to wait.
It’s not entirely clear what exactly they expect you to type under “How are you planning on using our SDKs?”, but I’m guessing they’re expecting some kind of contact information. (Otherwise, how would they be able to reach you?)
These are just assumptions; you can read the latest related post - that I found - from the developer advocate here: