Earlier quoted context omitted.
So the hope is that Starnix can emulate Linux syscalls well enough, while gVisor has been abandoned in later Google Cloud stuff because it couldn't emulate Linux syscalls well enough. Uh-huh.
Several operating systems successfully provide a Linux emulation mode. gvisor has very different constraints and requirements. It's also still heavily used and under active development so I'm not sure how you determined it is abandoned.
Newer generations of Google Cloud services run Linux VMs instead of gVisor.