That is actually accurate. I remove every single leaf from my grapes before I ferment. Green leaves can impart green flavors. Examples of green flavors are grass clippings, watermelon rind, and asparagus. I know what you are thinking, and yes, people eat grape leaves. They taste quite good in the right salad.
Assistant Winemaker/Cellar Manager
Inwood Estates Vineyards and Winery
1350 Manufacturing St. #209
Dallas, TX 75207