The (inadequately developed) point was that this idea could be built into an entirely new operating system with e.g. a different notion of a process—as opposed

The (inadequately developed) point was that this idea could be built into an entirely new operating system with e.g. a different notion of a process—as opposed to building new tools on top of Unix—and that this "operating system" could be a lightweight layer like HaLVM or Mirage, so such ideas could be explored without committing to building an entire OS.