Since no source is given anywhere on the page, I would assume that the source was this Naturei Karta group itself. I shall assume that the numbers have been multiplied X 500 or so unless evidence from a real news source is linked here. Even the NYT would be a better source than this.
Look at the pictures, 40 or 50 and a dozen and a half signs. Use a multiplier. There might have been 75,000 there. Like the Million Mom March. As far as I can tell, the only NY Times coverage, amazingly, was the ads. I would have expected an editorial.
This thread is probably more coverage that Naturei Karta has had in the last 50 years.