In SDK document, they refer ‘slug feet squared’, which describe ‘moment of inertia’ as a pressure unit, which is wrong. They mistook slug feet squared for slug per feet squared.
Slug per feet squared: pressure unit, SI unit: kg / (m * s * s)
Slug feet squared: MOI unit, SI unit: kg * m * m.
So, slug feet squared shouldn’t be a pressure unit.
They also wrongly marked ‘slug per feet squared’ as the unit of MOI in SimVars - Flight Model - Weight, which should be ‘slug feet squared’.