The seatpost itself is pretty strong. I'd be confident in its ability to support a rider's weight, excluding sudden forces like jumps (landings) as mentioned above.

BUT... If I remember your bike from pics in another thread, you have a LOT of exposed seatpost. The long post combined with the extra setback is going to be a pretty effective lever, applying way more force to the seatpost/frame junction than is typical, which may put you at high risk of damaging the frame.