Just tried adding PLA Tough to design BOM as that’s what I’ve used for the design due to its flexibility - its missing from the list of available materials
For some reason they manually keep the BoM and Store in sync, so they probably forgot to add that one. I don’t know why they don’t just run a daily script that syncs from the Shopify store directly 
The translucent PLA took a couple of weeks before they bothered to add it.
They clearly have no checklist when they add new products to complete the rollout.