This Linux distribution is a rolling release which updates dependencies at any time. So even if HCL Domino would be running today, a small update of the OS can break it at any time.
We are not recommending to use ArchLinux for HCL Domino.
References
Definition
Compatibility Definition
Color
Explanation
Certified
HCL has tested and supports this platform
Yes
Although not tested by HCL, seems to work just fine
Limited
May work with some some limitations. Use at your own risk