I think it will mostly be depolarized, from Wikipedia:
Relatively high degree of depolarization is also achieved by light passing through usual semitransparent materials like matte plastic or greased paper.
this post was submitted on 16 Oct 2025
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Out of curiosity: why would you want to polarize a speedlite?
Asking the real questions, here. If the intent is to polarize and then immediately depolarize the light output, that's just using a thicker diffuser with extra steps. Every filter stuck in front of the light source is just serving to block increasingly greater fractions of the original light output at that rate.
I'm positive there are simpler/faster/cheaper ways to do that.
Part of a cross-polarisation setup for reducing specular highlights. I think the same would apply to most other light sources but in this instance a speedlite is what I will have to work with!
Interesting!
A diffuser will definitely depolarize the light