Yea. Nano-forge will tell you need more experience before you can upgrade some more. But in his case, even if that same item is upgraded again, he can still use it, just cant upgrade it himself. For example, let's say the item's Clvl is 15, but he's lvl 20. Nano-forge will say need more experience before you can upgrade (don't quote me on the exact Clvl and lvl here). But surely if the item is upgrade 2 more times, he still can use it, but he needs someone of higher lvl to upgrade it for him w/o that restriction (need mroe experience...).