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So, unikernels?

No, not unikernels. They use unikernels and small linux builds for examples to show their improvement of Xen itself.

> We achieve lightweight VMs by using unikernels for specialized applications

Unikernels appear to be part of the solution...

Yes, but it's more "we made Xen faster so you can use unikernels even better". Unikernels aren't the new thing here.