Yes, all yield-based PlotBonuses in this mod are automatically scaled by the Science Modifier of the game speed that you're playing on, even when using custom game speeds. As long as the mod you're using speeds up things somewhat equally (which should be the case in a mod that just speeds up the overall pace) you will get reasonable results.

just want to check, will this go wrong if im using a game speed mod? its a mod that provides faster than fast game speeds. ill find a link to it if you need it!

Perfect!