I haven't had the time to read this article carefully (I will do so later), but it's very problematic to "gatekeep" religion or knowledge. If you're learning from eastern masters, if the original intent of the religion was to spread widely to any interested party, if you're being curious and respectful (you can even respectfully criticize, reject, or condemn any culture -- this is what enables rejecting and criticizing fascism even if not in your own nation; and this is what enables us to improve our society with cultural exchange). So on the surface the criticism here isn't valid at all.

Second, no person is obliged to adhere to a standard defined hundreds of years ago (or otherwise). Buddhism, and all cultures, are allowed to evolve according to our better understanding of science, the universe, ourselves, even philosophy, etc.. And also to fit well into people's lives and local culture. Most of the spirit of the Buddha is that of finding the truth and achieving enlightenment -- being too stuck to his every word is contrary to the spirit of his teachings. Secularity (I am a secular Buddhist) wasn't even too well defined in the time of Buddha I think.

If you don't want to learn anything about Buddhism, only the basics of meditation, no one should stop you. I think most teachings are very beautiful and well worthy of study, but that's ultimately up to yourself.

If you want to learn more, I thoroughly recommend masters like Thich Nhat Hanh and reading (perhaps commentated) Buddha's original thoughts (I believe Dhammapada summarizes many of them).