After update, the mod is still working at least on my phone.
If u have some issues, try to download the obb from this:
Download & install Cytus APK. Latest Version: 10.0.14 - Update Cytus APK: Feb 05, 2021 - Developer: Rayark International Limited - Package Name: com.rayark.Cytus.full.kr
apkcombo.com
and then rename the file to main.1003280.com.rayark.Cytus.full.kr.obb
move it to /android/obb/com.rayark.Cytus.full.kr
also if u directed to google play, try to close and reopen the game :)