I think the most important and sufficient thing should be matching email?
No. It's necessary to match legal name and birth date. And later, your Coinbase account must match the same data you gave Celsius in order to be paid.

As you can see, this is the error message displayed when I access my Celsius account. However, this platform is so cunning, that they dare displaying an error message with the exact same legal name provided and legal name on the document, plus date of birth provided and on the document.
There is no error, neither a single letter misplaced.
I don't know for sure, but i don't think the court would interfere in this part of the case, they would probably work with and refund only the customers who were able to update and confirm their data and so are eligible.
Well, the point is that customers didn't update and confirm their data because they weren't allowed to by Celsius. It's not customers' fault, because they have been in touch with the platform's support for months, without any replies from the other side. There are prints which can easily prove Celsius has neglected customers in order to not pay them. But you are right, I wouldn't count on the court, anyway.