Yea the spindle bolt is Lefty -Loosie BUT
I have had A Negative 'self extracting , experience'
where the un screwing of the Bolt simply stripped 0ut the threads ,
Never budging the crank arm .....
A) remove the pin spanner ring .
then unscrew the bolt ..... then use a regular extractor ... It engages All the threads in the arm...
the extractor ring has many fewer threads engaged...