Are these limits evidence-based or guesstimates to pull reassuring wool over our eyes?
The problem with any such guesstimate is that, of course, we are basing our calculations on a statistical sample of one.
an attempt to judge a quantity by guessing it → estimate: Could you give us a guesstimate of the numbers involved?—guesstimate /-tɪmeɪt/ verb [intransitive, transitive]