If you open up the Paklab kit, you will find there is no Kmeta nor Sorbate packs, instead, it has a "Stabilizer" Pack.
So I called Paklab today trying to find out, here is dialog
me: so what's inside
Paklab: it is Potassium metabisulfite
me: just Potassium metabisulfite
Paklab: there is...