According to the article you posted;
- Bingo??
- Craps??
- Roulette??
- Lottery??
- Video Poker??
Almost half of the games you mentioned in your blog is luck based game, so there's no skills or techniques needed obviously.
It is whether OP is not even understanding what he is talking about or it is just a click bait to make people click the provided link and he gets more traffic on his own site/blog.
I cant access the site luckily LOL. Surely, above mentioned games are luck based game type. I have never heard any games which is 100% based on skills, gambling games are always related to LUCK. Skill is just a part of some games like poker and sportsbetting, and luck is still the one thing that decide the result.