is there no way possible whatsoever for the customer to get back their money?
No. Scammers have permission from the judge to continue using depositors' funds to run their operations. Their strategy is to milk most money as possible paying their own wages as company's employees, so once the deadline for the recovery is over, there will be only pennies left for creditors. If the judge had decided the opposite then it would have been possible to retrieve funds partially. But that is not the case, so next time better to avoid these platforms.
The users of those platforms really need to read what kind of terms they are accepting when they sign up to them, they basically gave their funds away to Celsius and while it is completely unfair, the law only cares about what is legal and not about the unfairness of the situation, and I hope anyone which has not suffered because of something similar looks at this example and learns from it, as this is much cheaper than the alternative.