It's not great English - I would say it 'does a better job of preventing your food from getting freezer burn'. Freezer burn is what you get when you leave food in the freezer for a long time or without protection - the white area on frozen food that makes it inedible. The product is therefore stopping your frozen food from getting ruined by freezer burn.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
Newguest"keeping freezer burn away from the food"?https://en.wikipedia.org/wiki/Freezer_burn