Immediately reading the link, it seems like they either point out the obvious, or are blatantly wrong. In the five elements, 1, 2, 3 and 5 aren't elements of good horror, but elements required for horror with positive descriptors in front. Element 4 isn't even that true, since thinking of the first two great horror stories I've enjoyed, Stephen King's It and It Follows, neither of them involve big plot twists or huge reveals.
The first two of the suggestions are too obvious for me to even regard, the third is blatantly false, as Pennywise the Dancing Clown's motive never extended past "Feed", same with countless other great horror antagonists, and many more don't even have their motives clearly defined. The forth seems like good advice, the fifth reasonable until it ends up claiming that "Fear of flying" and "Fear of perilious heights" are "fodder for horror novel writing", and the sixth is... eh. A bunch of pretentious jerking off about the distinction between word definitions which could be infinitely better described as just saying "Use suspsense and the unknown" rather than relying on the actual monster.