Yes, those braze-ons are for a cafe lock.
I had considered adding one at one point, but ended up going with a different locking strategy.
Be aware: the tires and fender on the Allant are pretty large, so you might run into a situation where some (or possibly all??) cafe locks might not work directly out of the box.
For example, I noticed that the person in the following video (I think he may be an EBR forum member) had to modify his cafe lock in order for it to fit on his Allant+8S: