The main point of the tool was to quote the value of BTC whenever a page is loaded, so I personally don't think the time stamp would be necessary. It would only matter if the price was static and not changing at all, even on reloading after several hours or days.
I think it is necessary in sections such as Collectibles, which is the price at the time of ordering and the current price of Bitcoin, and it is useful for those who will visit the forum in the future, as a person can, for example, buy something for $100 today and it will be worth $500 a few months later.
Blockchair provides a similar service, which is to show the price at the moment the transaction is confirmed. It is important to know the real price when conducting the transaction and is useful for those who want to visit the site in the future.