In the comments section of this linked blog post, the blog author said it didn't work. I think I'll stick to "conventional" techniques for rooting cuttings, sphagnum moss, or perlite, or rockwool, or peat moss, or what ever growing medium you have on hand. I already have one or more of these media on hand.
Trick I've used with success on Satsuki azalea cuttings. A pot, 3 inch diameter or less, filled with my azalea bonsai mix (perlite & kanuma, or what ever I'm using that year). I make sure media is wet and settled before inserting cuttings. Cuttings are put into pot, usually I don't bother with rooting hormone, then place the pot & cuttings into a large zip lock plastic bag. Seal bag. Set in bright shade. Check every month or so to make sure not getting dry. Usually within 3 months have signs of growth. Then I partially open bag for a week, then remove bag and begin growing as a normal plant. Sometimes cuttings won't show growth for up to 9 or 10 months. Just keep bag sealed until growth begins. Growth is the signal that cuttings are rooted. Usually around 25% to 60% of cuttings stuck in pot root. I usually have 5 to 10 cuttings per pot, so almost always get 3 or more to grow. Simple, all done with available materials, and no rotten potatoes. Works for a wide array of species. Long fiber sphagnum moss is another good media, but the moss is difficult to tease out of roots when it is time to plant cutting that took out into larger growing containers. If you wait 2 years before separating the cuttings, the roots will be sturdy enough to survive the "teasing out" of the sphagnum.