Simply not true. They did have it longer than gas oils, but no more.
Rotella still makes an older version (H) for Detroit diesels, which requires zinc, but it's hard to find. The also make an even older version sold in Walmart and other places, sold in gallon jugs, same price as modern Rotella. I forget the name, but there is another letter in addition to RotellaT, I think they say it's for older cars, tractors, etc.
You'll have to decide if you need zinc or not, but it's pretty easily found these days if you think you do.