I think that this article means the opposite... and that Amazon could be liable for stuff that you buy from random Chinese dudes. So it should become less risky.
In both cases, Amazon loses business.
If you're selling in the US, I need to be able to effectively sue you and win in the US if you sell harmful or illegal products, full stop. So you should have to put up some kind of financial bond and a law firm to represent you. Because mom and pop businesses can't do this themselves, this should be provided as a kind of insurance policy that's just part of the cost of doing business. Heck, Amazon can be that insurance policy if they want.
But right -- if I can't sue you, you should under no circumstances be allowed to sell within the US on a US platform.
So any US corporation or LLC should meet the "US legal and financial presence" requirement that you describe.