Remember that the solar wind is ionized and follows magnetic field lines rather than travel in straight lines from the source. Parker saw an interesting phenomenon when it was especially close to the Sun: the solar wind sometimes turning back toward the Sun (switchbacks) before streaming outward again:
https://behindtheblack.com/behind-the-black/scientists-confirm-parker-entered-suns-corona-in-april-2021/

Link:
https://skyandtelescope.org/astronomy-news/humanity-has-touched-the-sun/

The solar wind travels a different path than the sunlight, so it is still possible and maybe likely that the wind gets into shadowed areas of the Moon, even permanently shadowed areas.

pawn: That is an excellent question. I suspect the theory is that the solar wind follows a rougher course than light, and since some light reaches the pole the spread of the wind can get it into areas the light does not reach.

Then again, maybe not. Like I said, an excellent question.