That may be correct. Just putting the info here. I find some of the info on HMF frustratingly incomplete. It will only get better if I help. As an example, the info for Condessa de Sastago shows it growing 7b - 10b, but I'm pretty sure it's been growing in my neighborhood for 80 plus years. We are somewhere around a 7...but it swings into -10F and colder on rare occasions. Botanica lists this rose as much more cold tolerant and taller which matches what I am seeing here. Maybe in time with some of those older varieties like this one, researchers have trialed it elsewhere and/or gathered reports? One person didn't write Botanica, it was many, which means tons more researching ability.