Arahantship is the permanent eradication of greed, aversion or delusion.
Moments in which these factors are not present could rightly be called vipassana (seeing things as they really are) but there is nothing permanent about this.
Not that it's relevant to Classical Theravada (though it may be related to the confusion, as far as I can tell) the Zen tradition often takes moments of "seeing things as they really are" as 'enlightenment' even though they too will concede such 'enlightenment' is temporary.
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"The uprooting of identity is seen by the noble ones as pleasurable; but this contradicts what the whole world sees." (Snp 3.12)
"To argue with a person who has renounced the use of reason is like administering medicine to the dead" - Thomas Paine