Interesting guarantee.
60 years, material only. So, if the basement of your house fails during that time, they'll give you a truckload of treated lumber to replace it. I set my barn on treated wood piles and have no regrets. Two types of material out there. AWW, for appearance, no meat tenderizer slots and the preservative doesn't penetrate very far. Not for below grade installation. PWF is for below grade applications. Order the pile material long enough, so you can get two, from each. Factory treated end goes in the ground. Field treating isn't with the same compound or as good.
Grizz