Whether a song is properly described as a folk song is one issue, and arguably an interesting one. Whether it is "relevant" is not the same issue.

For example, Mongolian throat singing is, of course a variety of folk singing. That doesn't make it particularly relevant to Liverpool.

"You'll never walk alone" on the other hand is more properly described as a kin dof ecular hymn. But it's words and sentiments, however hackneyed Jim might see them, are highly applicable to the circumstances of those who sing it, and highly relevant, especially in the light of their shared historical associations.