Not sure what you mean by 'validated market'? How can you have a 'validated market' without having a 'validated product'? A landing page, or a competitor's cust

Not sure what you mean by 'validated market'? How can you have a 'validated market' without having a 'validated product'? A landing page, or a competitor's customers, don't quite count as a validated market. A validated product is simply a product that people find of significant value such that they change their behavior to use it. That can be either paying for it, or just replacing some existing tool in their current toolchain.