Their escrow service is offered on all of the purchases they offer on their site.
You have the option to either accept to use it (by ticking it off before the purchase) or not too.
They charge 1% fee to process by going the escrow route.
It is pretty straight forward.

I have not seen an auction or sale that does not include this option to be available on their site.
So I do not know what you are saying as it is not available.

You want to continue to press and insist that is the case there isn't the option available from this seller
then I would say provide a screenshot showing what you are saying to be the case.