I believe that what the individual is saying is that he does not want brokers ("recruiters") to contact him about work they have solicited from a third party.
This is typical of a freelancer website. Businesses who often need work done on an as-needed contact basis (clients) will get regular contacts from brokers, who are in the business of finding contract work and finding professionals who can do the work. So, the work itself is solicited by the broker.
So, this advertiser doesn't want to involve a broker, since brokers will attempt to get him to work for about 60% of what he could expect to make negotiating directly with the client (at least, that's the going rate for IT services in the US, with which I'm most familiar).