Well, ''was'' is a past tense for ''is''. Meaning something already happened as opposed to currently happening.
''Told'' is past tense for ''tell''. Meaning that information that needed to be passed on has been passed as opposed to ''telling'' which would mean the info is currently being passed, or ''tell'' which would mean the info still needs to be passed on at some future point.
So, ''was told'' means that the necessary info has been provided.
''Confirmed'' generally means that something is known to be true and/or correct. ''That'' can mean many things, but in this case appears to be referring to the actions of one individual.
So, in this instance the person was stating that information had been passed to him (was told) and he has checked or vetted the info and knows it to be true and correct (confirmed).
Hope this helps.
You're welcome.