Confusing argument from GotQuestion (Calvinist) about 24 Elders

I read from this link : > A. Some people believe these twenty-four elders represent Israel,
> **but at the time of this vision**, Israel as a whole nation had not yet been redeemed. > > B. The elders cannot represent tribulation saints for the same reason >
not all had yet been converted **at the time of John’s vision**. > > C. The most likely option is that the elders represent the raptured > Church which sings songs of redemption (Revelation 5:8-10). What made me confuse is because on point-C, I can also say :
**but at the time of John’s vision**, there is no raptured Church yet. So, the question is :
Did Calvinist say (in point-C) that **at the time of John’s vision** there is already raptured Church? On the other hand,
If what Calvinist meant (in point-C) is at the time of the "End Time",
Then why the argument in point-A and point-B use **at the time of John’s vision** ?