He didn’t say that though. He said exactly what he said. Try to collect all of the items in your inventory. We already have what we have in our inventory.
What about the glitch items? The ones you can collect from quests? Like bananas, some people don’t have them, but some do. What about the people who don’t have episode 3?
Anyways, some of us have got one of every item already. The harder challenge would be getting 999 of every item, in doing so, also finish all the quests, get all weapons and clothing, and the rest of the stuff.