Answer: Seller has right to use proceeds to settle the loan.
Step-by-step explanation:
The Seller has the right to use the proceeds from the sale of a house to settle debt and this is what this seller is offering. The seller also suggests an escrow account which would significantly reduce the risk of default by the seller after being paid.
The seller can argue this in court and have a fair chance of winning because they fully disclosed the fact of the loan to the buyer and told the buyer how they planned to settle it, method which they had the right to use when settling debt of this nature.