#1

Eb  |--------------------------------------------------------------|
Bb  |--------------------------------------------------------------|
Gb  |-s13-11-9--------------------------9h11r9-----9---------------|
Db  |-----------------9h11-11-9------------------11---11-9---------|
Ab  |---------------------------11-9-11----------------------------|
eb  |--------------------------------------------------------------|


9h11r9?

What does the R mean?
#3
I dont think its pull off as there is another in the tab which is labled with an P.
#4
Well the symbols used in tabs aren't exactly universal. You'll often find yourself taking a best guess.

In this case, I think r means 'release', so yeah, a pull-off from the 11th fret you just hammered onto.