But those reasons would appear to be inconsistent, with what we know about this plant: It is well known to be an actual hybrid - that is an established fact, that goes beyond what is listed on the San Marcos Growers webpage. So technically you'd be more right putting it under Aloe hybrid, than Aloe species, since it is not an unknown species or a cultivar of an unknown species, it is an actual known, well documented in horticulture and taxonomy, hybrid, and recognized as a valid name:
https://www.itis.gov/servlet/S...

It is not recognized as a valid name now. The ITIS information dates back to 2011. The CoL's information is more recent.

We don't have a separate entry for Aloe hybrid. We use botanical names for our entries. Botanical names are Latin, and hybrid is not a Latin word. Some genera do have species names ending in hybrida, hybridum, or hybridus, but Aloe is not one of them.

You can tell how obsolete the ITIS information is from this fact: ITIS says that Aloe x spinosissima is a hybrid of Aloe humilis var. echinata x Aloe arborescens. Aloe humilis var. echinata no longer exists. It's a synonym for Aloe humilis.