This is an easy solution.
The solution was already provided.
There is no point for a company to close winning accounts just because they win, and provide a refund - any account wins sometimes. And if a player wins - he is likely to bet again.
As you could have noticed in our tournaments, most of the winners has account numbers that starts with 1 and 2, when new account are already generated with number 3. Accounts are generated in sequence and counted in millions already.
In addition - there are proofs of way higher withdrawals than 0.55 BTC.
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This user was paid out and should have recorded his withdrawals on his other accounts too.
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The answer was given dozens of times, here are some of them:
one,
two .
Sincerely,
1xBit team