Precisely. (Same for Lagat 3:26/1:46.)
I get the sense that some see an either/or thing going on if Jakob was ever to get to 1:43. ie If he runs 1:43, he does it at the expense of his cherished 1500m/5000m. Surely one can make significant tweaks to training instead of throwing out the baby with the bathwater.
I maintain that 800m is primarily aerobic!! (Maybe a new thread?)