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For argument sake, yes they have filed court arguments claiming to be the owners of the wallets, ... But what if someone else had the keys to these accounts?
Basically having the keys establishes ownership to the wallet(s) but also since these are dormant basically abandoned wouldn't this be all that is needed?
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Wright has already been outed by signed messages of a couple of the addresses he claims ownership on, so yes, someone else has (some of) the keys:
"Craig Steven Wright is a liar and a fraud. He doesn't have the keys used to sign this message. The Lightning Network is a significant achievement. However, we need to continue work on improving on-chain capacity. Unfortunately, the solution is not to just change a constant in the code or to allow powerful participants to force out others. We are all Satoshi."
Probably not satoshi, but defnitely not Wright's coins.