I like openness and discussion about such attainments. Maybe not
in a way that breaks the Buddha's precepts. As Ajahn Brahm said,
you can actually know of someone's attainments by asking a fellow
monks who knows him well or is a close acquintance of that other
monk. Because monks can reveal attainments to other monks but not
to lay persons.
Unfortunately none of those who are claimed to be arahants have so
far convinced me that they are (nor am I convinced that there is
any living master that is an arahant - whether he/she has
proclaimed it). Perhaps the clearest in terms of insight is Daniel
M. Ingram, but even him (who self proclaims himself to be an
arahant) I do not consider an arahant in the traditional Buddha's
definition of it.