Why is free cash flow sometimes referred to as a liquidation concept?

Question:

Why is sometimes referred to as a concept?

Free Cash Flow
Free cash flow (FCF) represents the cash a company generates after accounting for cash outflows to support operations and maintain its capital assets. Unlike earnings or net income, free cash flow is a measure of profitability that excludes the... Liquidation
Liquidation in finance and economics is the process of bringing a business to an end and distributing its assets to claimants. It is an event that usually occurs when a company is insolvent, meaning it cannot pay its obligations when they are due....