I think in this context, saying that it's not a thing that google doesn't like old content just means that google doesn't penalize sites as a whole for including older pages, so deleting older pages won't help boost the site's ranking.

This is not the same as saying that it doesn't prioritize newer pages over older pages in the search results.

The way it's worded does sound like it could imply the latter thing, but that may have just been poor writing.