They also have a pretty strongly worded statement on the tables:
"This V-Planner generated dive schedule could indirectly kill you, and probably has bugs. The author does not warrant that it accurately reflects the Varying
Permeability Model algorithms, that it won't get you bent or dead, or that it will produce safe, reliable results. This dive schedule is experimental and you use it at your own risk. Diving in general is fraught with risk, and decompression diving adds significantly more risk. Deep diving utilizing multiple gasses, including Helium, is about as risky as it gets."
Phi plagiarised the same warning for Decoweenie - I'd write much the same if I wrote any deco software. Wouldn't you?
I doubt many divers haven't at least heard of somebody getting bent even though they were within deco limits - if you left your software open to blame, you'd gaurantee yourself at least one trip to court in this day and age..