Yes, geminiflora is usually solitary and a multiannual (dying after flowering). The one here has not made any offsets but it has not flowered yet. A. geminiflora also usually has marginal hairs, but the one here does not. The leaves on geminiflora are usually longer and more flexible than stricta or striata, which are so close together that I can't really tell young plants apart. We saw a bunch of strictas and striatas in central Mexico and they are really nice looking plants in old age, especially as they tend to make axial branches (like the one here has already done after flowering).
So to resolve geminiflora from stricta/striata, judge by size and leaf flexibility, and usually the presence of marginal hairs. To resolve stricta from striata, don't ask me.
There are some excellent details in Greg Starr's agave book where you can learn more about the ins and outs.
I hesitate to try to identify the agave in the original post because it appears to be getting less light than I give my plants. It's probably stricta or striata if I had to guess. Bend the leaves and see if they are flexible.