Edit: Nvm you're good :D
If shaders are considered consumables (which I would think they are?) you may want to make sure you have at least one in your inventory based on this part:
>If you have an item in your inventory right now, you can safely discard it and retrieve it from Collections in September. This does not include consumables, so hang on to those if they matter to you.
That only meant things in the Consumables/Modifications tabs of your inventory screen. So things like Cayde's Treasure Maps. Shaders are being tracked and are safe to use/delete!