Having a brief look at their traffic on Ahrefs; They've lost a bit of traffic, but it doesn't look like it's halved: 59 million to 49 million. https://i.imgur.com/fB1z5aq.png

Having a look at what their organic search movements are, most of them are just for celebrity names. Here's a screenshot: https://i.imgur.com/NvWT0Y3.png

It seems in this update, and Google is putting a lot less emphasis on the word count. Instead, they are putting more emphasis on having the exact keyword in the title tag and coming from a domain with a lot of authority.

Google could have also struck DailyMail with a Manual Action (aka a penalty for breaking their TOS) which would vastly affect their organic traffic. Manual action is explained here: https://support.google.com/webmasters/answer/9044175?hl=en