The last three settings are for sand miners, not bio-reactors:

[mod-setting-name]
burner-sand-mining-drill-crafting-speed=Crafting Speed of the Tier 0.5 (Burner) Sand Miner
electric-sand-mining-drill-crafting-speed=Crafting Speed of the Tier 1 Bioreactor
biotech-ext-sandminer-2-crafting-speed=Crafting Speed of the Tier 2 Bioreactor
biotech-ext-sandminer-3-crafting-speed=Crafting Speed of the Tier 3 Bioreactor

Hey Pi-C, since he's done with Factorio, (quoted by him "I'm not doing Factorio anymore, but I can give you permission to edit."), would you consider a remake or rewrite of this mod? And don't forget the add-on with graphic updates, https://mods.factorio.com/mod/matts-biotech-changes and the other fix pack: https://mods.factorio.com/mod/PhotosynthesisAbsorbsCarbon . Me and my brother would help out as much as we could with the project.