Hi Matt,
I think that the post you referenced might be a bit out of date with how we typically recommend users handle this in the more recent versions of HyperSizer.
Our best practice in general is to use the
"Zero Out FEA Moments" option on the sizing form for flat panels with FEM pressure loads, and enable "Panel Pressure" in the same section. This will ignore the moments in the results file, and turn on our offline pressure calculation to determine bending moments and transverse shear loads due to pressure on a flat panel. This offline pressure calculation reads the PLOAD cards in your FEM to determine the pressure applied.
This process usually works pretty well for aerospace, since most acreage panels see relatively small bending moments due to mechanical loading, so ignoring those from the FEM and calculating what they should be due to pressure is usually fine. Note that we don't recommend this for curved panels, as it would generally be very conservative to treat it as flat, and FEA does a pretty good job of getting hoop tension, bending moments, and transverse shear for curved panels with a reasonably well-refined mesh.
Thanks,
Stephen