Quote - ... he mentioned his copy of Vue6 xStream, and these fractal functions ship with Vue7.

They are there in my V6XS.
The datestamp suggests that they were either part of the final release or added by the one of the first updates to the final release.

The list of folders in the second screenshot corresponds to what was in the pre-release Beta, which would seem to confirm the above, at least enough to warrant a version number check.