First of all, that's a totally different case (maybe it's yours), so it has got nothing to do with this one. Each case is different and should be looked at separately. And the second thing is, Stake posted in that thread that all the evidence has been sent to AskGamblers on 23 November. After that, there are no more posts by AskGamblers either confirming or denying that the evidence was provided.
Since they are asking customers to post a hash (transaction ID), it does indeed seem like addresses are being reused among different clients. Now, it's a matter of checking with Stake if that could be the reason why they believe you are using multiple accounts. Can you post a link to the Orbit exchange? I would like to create a dummy account and compare my ETH deposit address to yours. Other people can do it as well if they want.
To my understanding, there is an easy way to clarify this issue once and for all. If multiple people share addresses on Orbit and also have account on Stake, it should be enough for Stake to KYC those accounts.
Or am I missing something?
Yes, but the problem with KYC is that a lot of private data has been hacked, leaked, or sold in different places. Someone could be using ID cards that belong to someone else or you could pay someone in a 3rd-world country a few bucks to do the KYC instead of you.