Not trying to pile up on OP, just thought it was a funny meme 
Anyway… to address the matter-of-fact at hand, as @_KoBa and @Uberdude already pointed out: that list would be the list of the first 10 usernames that were created on the server formerly known as Nova gs.
To equate them with individual users would be wrong since, for example, matburt, bdsmatburt and matwjones are all the same person (presumably each username existed for a different purpose). Even I have a few alts, which I shall take to the grave
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Also, bear in mind that Nova gs appeared in 2012 or so, while old OGS exists since at least 2005. Current OGS is the successor to both, therefore those aren’t even the oldest users in this server. For example (not a flex, just a fact) @trohde , Uberdude and I are all older users than that whole list.
So, you could say, it’s a matter of finding the starting point of OldGS users right!.. right? Well, that would yield user #2098 a.k.a Arathalion. That’s a good start! Let’s just take the numbers from #2098 to #2107 and call it a day.
But that would also be wrong! First of all, there is the issue of duplication which I mentioned before. But more importantly, there were people who had an OldGS account simultaneously as they had a Nova gs account. They were old users who wanted to try the new server in town. Topazg being the most notable that comes to mind.
Upon merging, users were numbered sequentially, first Nova users, and then OldGS users. However for those who had accounts on both sites, if they wished to merge their accounts, only the Nova gs id would prevail.
Therefore, you’d need to scour all those first 2097 ids to data mine their registration_date if you want to be sure, and then merge sort it with the post #2098 user list to have the complete sorted list. Oh, and don’t forget there are duplicates!
It would be a fun excercise, but time and resource consuming.