He is implying that founders can create a lot of value without employees, and that the claim that employees also create value is false. If that's true, then what about a social experiment: If you are a solo founder, you get all your profits for yourself. But if you have employees, you have to share your profits with your employees. If employees don't produce any value, easy, fire them all, you get everything. But if…
I agree that Paul is severely overstating his case here (as is his wont), but only the first half of your summary is true to his tweet. He's saying that founders create a lot of (even most of) the value in a company, but he is not saying that employees create no value.
His argument is essentially this: If employee jobs can in theory all be automated away while a company still produces value, that means the startup founder's role must produce a huge amount of the value in any company.
This is a pretty fragile argument that has a lot wrong with it (that a job can be automated today doesn't mean it wasn't extremely valuable yesterday), so there isn't really a need to erect a straw man.