No. There's a *big* difference between the load limit printed on something and it's true expected failure point. As somebody could be hurt by the chair failing I would expect the real strength to be in the ballpark of 3,000 pounds or even more. Figuring the permissible % of expected yield point is handled by the engineers, normally not by the end users.

Load ratings near the failure point are only done when the failure will not cause a problem, or when the failure is actually a desirable property (breakaway tethers of various types.)