I could add to the error in the article. The whole section A culture of hospitality and honoring kinship is really based on conjecture and extrapolation. Then in the next section he uses Luke 2:4-6 to somehow indicate they had been there for days. Again conjecture with no solid evidence. Not that it matters but the entire article is evidence for a slippery slide into error. While I do agree that tradition can slip in non biblical truth but this article doesnt add anything.
And scripture. The article cited scripture to show that followers of the Lord were supposed to be loving toward strangers. And yes, there is some speculation but it's based on realistic ideas.
Then in the next section he uses Luke 2:4-6 to somehow indicate they had been there for days.
The point is to show that the traditional idea that they were traveling and then...ooops...sleep in a barn and have the baby is kind of a gross simplification. As far as a slippery slope I don't see it that way. As I said it takes it out the realm of fairy tale, which may stop many from becoming believers, and puts it into a realistic scenario.
I see it as strengthening faith.