If bitcoin was worth zero would you be happy to get zero back for your bitcoins?
Happy... no. But at least I would be getting back what I put in.
50 BTC in ... 50 BTC out.
$50 in... $50 out.
The claim form suggests that they are aware of the difference, since it asks for "5a. Total Amount of Cash Owed USD (if any)" and "5b. Total Number of Bitcoins Owed (if any)". Clearly then the liquidator understands that the debts are in two denominations.