TL;DR Rosetta won’t work on Linux ARM VMs under Fusion.

Apple specifically calls out that Rosetta for Linux is available for virtualization applications that use their high level Virtualization framework. UTM uses this framework. Fusion does not. It uses the lower level Hypervisor framework.. 

If you can find the documentation that says that it does work under Fusion, could you provide a kink  because everything that I can find does not say it’s supported.