
Incorrect headline? "Vegetables are now half as nutritious than 60 years ago."
This is a headline from an article in a respectable newspaper (https://www.independent.co.uk/news/uk/home-news/vegetables-nutrition-soil-quality-decline-b3063325.html).
The use of "than" in this construction doesn't seem right to me. If it were "Vegetables are now less nutritious than they were 60 years ago" I wouldn't have an issue with it. But I think if you use "as" to start a comparison you have to use a second "as" to complete the comparison, so it should read "Vegetables are now half as nutritious as they were 60 years ago." Does the newspaper headline reflect current usage, or is juxtaposing "as" and "than" just wrong?
Edit: By "respectable," I mean the paper probably still has copy editors on staff.