Maybe he means just the sprint boots, but to progress to travel boots when you can?

Why sprint boots and travel boots at initial progression?

The seventh item is a consumable that is used, then disappears like a halcyon potion or flare. With this taken into account, he only had six items in his slots. The crystallis should be bought when you have over 1000 gold to spare and is six slotted. Sell your boots (or anything cheap), buy the crystallis, consume it for the boost, then buy back the boots (or whatever you sold).

U have way to many items a build! it is only 6 ingame