Do you have any evidence to substantiate this claim? Especially where the "rock flower anemone", E. crucifer is concerned. Any evidence at all?
The "mini mini"/ S. tapetum reproduces about as fast as aiptasia, so I don't doubt fragging this species could be successful. Although I don't understand why one would want to.
The "maxi mini" (Maybe a form of S. tapetum, maybe a completely different species????) hasn't been in the hobby long, so well documented success with fragging this animal is hard to come by. At least I haven't found it. I've seen evidence of people cutting them in half, but evidence of long term survival seems to be limited.