That's an intersting article.

I think a lot of the trouble of speaking of dangers of mediation is that we lack a coherent system about talking about different kinds of meditation.

Also, it is forbidden to ever question anything they said, because it is holy, and they are better than you can ever hope to be. This is why meditation teaching remains stuck in the past – they are determined to preserve their traditions, that's their job. And tradition means no innovation.

This paragraph is intersting. That not the kind of paradigm of the people from whom I learned meditation. At the moment I'm learning under the framework of perceptive padagogy of Danis Bois who's a French men. You might not get answers to every question in a way where you understand the answer but you are certainly not forbidden from asking anything. Sometimes the answer to: "Should I do A or B?". is "That's a good question. Take it with you in your next meditation."

I haven't interact much with real Zen Buddhists but read them. It's my understanding that they have a concept of beginners mind that's about not declaring things to be holy but always being open for learning something new.

Having already an idea of meditation I wouldn't shy away from staying a bit and learning the style of someone who considers some knowledge holy and forbidden from questioning.

When you are a beginner I would recommend to stay away from such teachers. I would also stay away from people who tell you to renounce your bodily desires.