These do
not actually convert VGA to Composite/S-Video, this only tells cards designed for it to output Composite/S-Video on the correct pins. Unless your card was designed to use this adapter, it won't work.
Which is what the seller meant by "It will work with laptops and desktops with VGA cards that has TV-Out function capability".

I really wish sellers would be more clear on these kinds of things, but the seller may not have really known.