Does the 7 days Shipping Time Frame deadline mean that I have to guarantee that the item will arrive within 7 days?

No. The 7 days applies from when the seller receives the winner’s shipping address and shipping payment (if applicable). Once that information is gathered, the seller has to send the item within 7 days. Depending on where the item will be sent (whether domestically or internationally), it may take more than a few days to arrive.