Good question. I read it to mean everything except indebtedness.
And, what is included is always the problem in asking or responding to this question. For instance, if people are work camping, are they including value received or just reporting $0 for camping expense? Then there are intangibles like "free" health insurance via a previous employer that don't make it into the reported expenditures.
If the idea is to collect information for those researching the lifestyle, then some level of standardization is probably needed or else the amounts don't tell us very much.
However, if enough people answer, then, even without some of these concerns being met, a general average can be found.
As I said in a thread earlier this year, I think the average retired fulltime couple spends about the same amount as any other retired couple spends which is around $41K, although the fulltimers might be just a bit under that.