Interesting article. Never done an unassisted pullup. I'm long-armed, long-legged and short-torso'd so my body type might not be ideal for that goal....
I'm vaguely remembering a time when many municipal police and fire departments would use lack of ability to do a pullup as a reason that women weren't physically qualified to be officers/firefighters.
A woman with whom I grew up broke the gender barrier at the local town fire department and she had to train like a
dog to meet the pullup/chinup requirements for her fitness tests. This was someone who starred in every possible school sports team open to girls at the time (soccer, field hockey, basketball, softball, track) from grade school through high school, had strength and endurance to burn, and wasn't going to be 'fit enough' to be a firefighter?!?!?!