Static wick are likely to be cosmetic only. Much work and testing is
required to make them operational.
THE test;
Take a 100W landing light and connect the positive to the battery positive
with a long extension cord.
Next, connect a short jumper from the light negative terminal to a screw
inserted in static wick receptacle.
If light is bright= good static wick that will do the job and reduce pitting
on LE.

I'll wager the subject airplane with pitting and static wicks have more than
a few in the cosmetic category.
Charlie K.