Would it be fair to assume that it wasnt until july 30, 2010 that people could start buying bitcoin on any exchange and not only new liberty standard? July 30 is the earliest date i can get on this calculator website...
If there was any official price before the listed July 30th which you saw on the calculator, then take it as you saw it, the bitcoin calculator may have (based on the resources available to them even till this moment) only can provide a bitcoin price starting from the mentioned date, July 30th, you have to take it like that since this price isn't when relevant or important now, as it's not like you can turn back the hands of time to buy bitcoin at that price now 😁
The opportunity to do so has already been missed and what we can focus on right now is to ensure we do not miss future opportunities as well, for as far as I believe, bitcoin still has a long way to go and so does the price as well, but incase you feel the current price is already too expensive, that's up to you but like I did said before, finding the actual or official price bitcoin started selling from has no importance at the moment except for historical knowledge and nothing more.