What they are not, however, is  that is, an anecdote doesn't tell whether it is the only such instance or whether the problem is wide-spread.
The anecdotes tell if it is just a single instance.
mnli hypothesis: The anecdotes tell if it is just a single instance. premise: What they are not, however, is  that is, an anecdote doesn't tell whether it is the only such instance or whether the problem is wide-spread.