Apparently there is some issue with running hotfix 3 or 4 multiple times: someone reported that it filled up their NAND doing so and they had to reflash, though I can't seem to figure out how that would be possible. It should not make a difference, it's just a bunch of opkg installs of packages which will, at worst as you say, do nothing because it knows the version it is installing already exists. It may have been an isolated incident with other things going on.