Best Tangetized explanation found : Whoever wrote that is mistaken (or very incorrect). The verb/adjective is "Tangentized" (with an N). It's a term that has been used by Tangerine Dream fans after Edgar Froese released a collection of their tracks called "Tangents". Tangents collected old classic tracks, but they had been modified by adding instruments that couldn't have existed at the time, and/or modified in some other way, thus pissing all old fans off because classics (and I wholeheartedly agree) should never be altered. Make a new version, if you want, but leave the original alone.
So the expression "tangentized" was created to define such an operation, which unfortunately Froese repeated in the following years.