It's as meaningful as the way the job numbers are polled.
If you looked at the percentage that those 17 make up of all professional US economists, and looked at the percentaged of those polled on the job rate against all individuals over 18 in the US, I suspect that the percentage would be greater on the polled economists. There aren't that many well-known and well-respected economists, and there are a lot of people eligilbe for work in the US. Yet, some people have no problem with the small sampling for the job numbers - when they support their political position.