I'm not even sure how you got to that page. IF you go to the FAQs at the bottom of the page, you get to the link below and it is exactly what i posted.
https://goldin.co/faq
But lets dissect the wording of your link which i can't find on the website other than using your link. How did you get to the page you reference. Your link has the text "preview" -- was this something sent out in January?
"Lots that receive more than 1 bid before 09:00 PM on closing day will remain open for bidding for 30 additional minutes. The timer resets to 30 minutes with each new bid until the timer expires with no new bids."
The first sentence references lots before 9pm. How about in extended bidding? The next sentence you could infer that you are still talking about the individual lot, but it doesn't reference lot or auction in that last sentence. Why not be concise? The FAQ i referenced was not clear at all. Much less clear than what you posted and most would go to the FAQ at the bottom of the page. Still not sure how you get to your page if you go to goldin.co