Wonder if this happens in the wild too? It seems even more intimate than parental care provided by Amblypygids.
That, of course, is the big question. I suspect that when the mother first emerges it does happen. The babies remain in the burrow for a while and it's quite likely that Mom brings home food for herself and probably is at least tolerant of the babies feeding.
Not long after that the babies start to disperse and dig their own burrows. In captivity the burrows, by necessity, are close to the mother's burrow. And in captivity the mother has been observed to carry food items to the burrows of the babies and draw them out to share the food at least several months after dispersal. But as far as I know we don't have observations of this in the wild. It would be very interesting to find out how far the babies disperse in the wild, and how much this affects parental food-offering.