Eldar holofields are in the Apocalypse rulebook.
Even in Apoc if a Valk is intending to embark or disembark troops it has to move as a Skimmer for that turn and so will lose the BS6 and +12" range benefits of being a Flyer, so having it just act like that the whole game isn't a big issue.
Points wise though a drop is recommended - the IA2 Update
PDF has the Valk at 120pts now instead of the 140pts in
IA Apoc and
IAv1, so I'd suggest dropping it to 120pts (or maybe a little less) if using it solely as a Skimmer.