I thought the article had a few insights like players not wanting to hit half volleys but I did not find it really helpful. It described a half volley and stated they are pretty much a pain in the asse, but no real instruction.
If I am at the baseline, I play half-volleys off the short hop - bend the knees to get the hands down to the ball. Small backswing, a bit of top on the FH and a bit of slice on the BH, with a full follow-thru.
If I am in volley position or moving to volley position, I play it with nearly no backswing and a bit of follow thru. Amost always slice BH, FH will be either a touch of slice or a rather flat pick-up with maybe a touch of top.