Negative. Slicehost launched in the middle of Linode pivoting virtualization stacks after proving out the business and running into limitations of their first stack (UML). Slicehost was ... 2006, if memory serves? Linode was a few years old by that point. For those keeping score, Linode then went to Xen and now KVM just like everyone else.
Linode and Slicehost were very similar stories, though. Slicehost bootstrapped as well and was run by good people.
