I would have not said 100% but you are right on this one. Males just do not get that big, or the dozen or so that I have had did not.Albopilosum as with most brachys are easy to sex ventral.........
Even with that blurry picture you would be able to see the dense patch of hair above the epigastric furrow. At around 2" you can see that patch with ease.
And second Albo males never get that bulky ever. They top out around 4.5 and are skinny scrawny little guys both before the maturing molt and after.
I dont rely on the body type to sex though, with this one the ventral was enough.