The oerating limitations say it clear enough, "No person may operate
this aircraft for carrying persons or property for compensation or
hire." It means specifically that the aircraft may not be the source
of revenue. Using the plane to carry a paying passenger is using the
plane as the source of revenue. Using it to carry cargo is also use
for revenue.

On the other side, using your own experimental plane to take aerial
photographs for your own business is not using the plane for the source
of revenue, the source of revenue is the photographs and you are
entitled to using your own plane for that purpose. You could not
however, use the same plane for providing the same service to another
person or company. See the difference?