In 2021, Ubuntu Cinnamon Remix is still struggling to become an official flavor, just like Ubuntu Unity, and I think the Ubuntu community needs both of them for diversity.
The latest release, Ubuntu Cinnamon Remix 21.04, codenamed “Hirsute Hippo,” is here to prove that the project is alive and kicking. As you can imagine, Ubuntu Cinnamon Remix 21.04 is based on the Ubuntu 21.04 (Hirsute Hippo) release, which means that it inherits all of its updated core components, starting with the Linux 5.11 kernel and continuing with the refreshed toolchain consisting of GNU C Library 2.33, GNU Binutils 2.36.1, Python 3.9.4, and GCC 10.3.