That seems a particularly odd use of the term given that, as you say, the title is mostly descriptive.

However, more broadly some people seem to use the term for anything that isn't just blandly descriptive. Headline writers have been pulling out interesting facts or making clever puns or whatever device to persuade people to read stories since before there were clicks. The average headline in The Economist probably qualifies as clickbait if cleverness is off the table.