I wondered that too, the poster has a short post history but it goes back 6 years, one alludes to being in the military, which makes sense, as military planes are the only ones I know that can pressurize and still have doors that can be used to skydive from.
Not sure what prompted the question, as you would think ops for military would have standardized a long time ago on procedures, but maybe there are some new ideas for pressurizing on flights that are being debated.