I think that St. Paul understood that following laws for their own sake is anathema for the Christian, and so he mentions over and over again that much of the external lawkeeping is only valuable so as not to harm weaker persons who are not yet ready for “solid food”.
What St. Paul really thought about food regulations is best seen, not in the texts cited in the earlier article, but rather in 1 Timothy 4:1-6.
exerpt: “For everything created by God is good, and nothing is to be rejected, provided it is received with thanksgiving” [v4]
While not specifically making the connection, I think that things which fall under his phrase “profane myths and old wives’ tales” are notions such as that the life is in the blood, and that other old Hebrew idea that the seat of consciousness was in the kidneys.