First of all it's decryption fix for stock MIUI, secondly decryption was and is working on xiaomi.eu mmx etc and you don't have to mount system and vendor
/* * Your warranty is now void. * * We're not responsible for bricked devices, dead SD cards, * thermonuclear war, or you getting fired because the alarm app failed. Please * do some research if you have any concerns about features included in this recovery * before flashing it! YOU are choosing to make these modifications, and if * you point the finger at us for messing up your device, we will laugh at you. * */
Sorry to hear. It's still beta i'll try to fix that in future updates. Thanks for your feedback!