You need to look at the skeptics skeptically also. A red flag came up when he questioned the age of the tilma saying:
Here are the facts: the ayate does not come from native cactus plants, but is of woven hemp,
Actually, that’s not a fact. Hemp comes from the hemp plant. Marijuana is related to the hemp plant.
Image result for what is hemp fiber made from
The bast fibers can be used to make textiles that are 100% hemp, but they are commonly blended with other organic fibers such as flax, cotton or silk, to make woven fabrics for apparel and furnishings.
Hemp - Wikipedia
Ayate comes from maguey. The maguey has traditionally been classed as a cactus by laymen. But it is technically, not. It is in the same class though. Maguey and cactus are both “succulents”. Hemp, is not.
The Miracle of Maguey | Eat Your World Blog
Jan 10, 2013 -
The maguey cactus, native to Mexico, is best known for its place in alcohol, specifically tequila, but it’s also eaten in a variety of ways, used to make fabric and clothes, and taken for medicinal purposes. Not a looker, this giant, spike- covered plant somehow made its way from desert cactus to unexpected star …
(Mexico) A cloth made from the fiber of the maguey plant, similar to henequen or sisal. (historical) A cloak-like garment made from this cloth.
ayate - Wiktionary
https://en.wiktionary.org/wiki/ayate
from the plant agave fourcroydes native to Mexico.
Yep. They got this part right.
The agave, a succulent plant which closely resembles cactus. Not a hemp plant.
This could explain the Tilma’s remarkable state of preservation. Hempen cloth can last hundreds of years. It is one of the strongest fibers known.
Well, if that’s true, why aren’t there more tilma’s laying around?
Considering that everyone agrees that St. Juan Diego was not a wealthy man. I’m thinking that he was wearing something made of the cheapest material that could be found. Therefore, I’m pretty certain all the people of his village were wearing something similar.
I mean, a fiber that is cheap and ordinarily lasts 500 years! We should be making everything out of that stuff, even today. Why are we using cotton or anything else?
So, I’d fact check that entire article. Although, some of the other things he said sounded reasonable. This particular point makes him sound like he’s got an axe to grind.