Yeah, it ended up with the same OG as the table sugar, so close enough to 45 ppg. 25 SRM is probably about right since it was a bit lighter than the soft dark candi sugar that is listed at 40. That said Moscavado is variable product, so some sources will be more or less refined than others.
On a side note, be careful with that blackstrap molasses, it can get metallic tasting pretty quickly. I’ve had better luck with “mild” molasses, much rummier less harsh character. That said a big beer like a barleywine should be able to stand up to some rough notes after some age.