The article's claim about the Council of Vienne is incorrect: the Council was condemning the errors of the Beghards and Beguines, one of which errors was the claim that a woman's kiss was sinful [1]. Thus, the Council was in fact saying it was not sinful to kiss romantically.
This was common for the anathemas written at the time, it would list all the positions, and then at the end say “anyone who holds these let him be anathema” - basically a “not” applied to all of them.
So if you read one out of context it’s confusing.