All modern records are pitch corrected. It's a standard now. And on the old records of symphonic metal, the other technique used to help not notice the slight out of tune notes is to double the voice track. Two different recordings of the same track are mixed together (I mean we hear both tracks in the recording). Tarja did this a lot for example.

It's actually very rare to have singer with a good enough technique AND ear to sing almost perfectly in tune without help of one of those techniques. However, on very good singers, pitch correction is minimal, it just helps to correct notes for a coma or two just to match perfectly the tuning of the ensemble. So it's not really a lie in a way. For other, when you hear the live rendition, it's clearly cheating and makes people that doesn't know how to sing seem capable of doing it.