My minimal backpack camping checklist has 25-50 items on it, and that's with counting "first aid kit" as one thing, "tent pegs" as one thing, not counting clothing I'm wearing, "food" as 1 item, etc.
There is no way that an adult has 100 things inside an entire flat they eat, work, leisure, and sleep in. I assume that they mean 100 valuable things that they wouldn't want to just lose.
