Griddy defaulted and was unable to pay their financial obligation to the market. They tried to put some marketing spin on this but simply put, if you cannot pay your obligations, then ERCOT will initiate the default procedure. This is terrible for the remaining market participants who are still solvent because now Griddy's debts will be shared by the market.
Griddy should inform the public how much exactly of the $2.1B short pay they are responsible for.