Learn English – the tense that used in this sentence

This is a bit clearer if rather than "still relevant" you think of the perfect tenses as expressing a current (with respect to Reference time) state, not an event.

The English phrasal verb be born, however, designates an event: birth, which is the punctiliar fact of entry into a state of extra-maternal existence (I am being as pompous and mealy-mouthed as possible to avoid politico-theological controversy). An event is expressed using a simple form, not a perfect form.

There are circumstances in which a perfect construction with born is proper; for instance:

A son to the Earl has now been born, so his nephew Roderigo is no longer the heir apparent to the title.

Here a current state is spoken of: the existence of an heir presumptive. But if you want to locate the birth in time you are speaking of the event, not the consequent state, and you must employ the simple tense:

A son to the Earl was born yesterday, so his nephew Roderigo is no longer the heir apparent to the title.

In a perfect contruction, the lexical (main) verb does not indicate the tense. What indicates the tense is the perfective auxiliary verb—i.e the form of HAVE before the past participle. So "it has been considered" is present tense.

Now what is "been" here?

The main use of the form of BE is to mark a progressive aspect and a passive voice*. In the progressive aspect, the BE is followed by a present participle verb as in

He has been running. (Active voice with progressive aspect)

In the passive voice, it's followed by a past participle, as in your example

It has been considered wrong. (Passive voice with perfect aspect)

_{*Not always. Not all passive contructions are marked by BE. We also have bare passive, concealed passive, and get-passive. Those don't need a BE to mark them.}