Well, first off, most flavorings are PG based. So you'd need to find a flavoring company that deals specifically with VG base flavorings. Secondly, the nic would have to be diluted in VG.
Two things about nic diluted in VG...VG does two things to nicotine, draws in moisture and draws in oxygen, two things that are not friendly with nicotine and make it go bad QUICKLY. So you'd need to load it up with preservatives to keep it from turning.
You'd also need all of the additives and sweeteners to be VG based.
Primarily all of these flavorings, additives and sweeteners are diluted in PG because PG seems to be the most common carrier for diluting, preserving and holding certain molecules in suspension, preventing things from re-crystalizing.
If this cat has all of these bases covered without the use of PG, then kudos to him on his "all VG" liquid.
However, I'd appreciate he not use my (or others) suppliers forum to peddle his wares. He should at least have the tact to pay for his own forum, such as all of the other suppliers have.