A lot of newsrooms have already done mass layoffs over the years and there isn’t much more to cut other than shutting down.
https://financialpost.com/pmn/business-wire-news-releases-pm...
https://www.ctvnews.ca/business/corus-entertainment-says-ong...
Can sort by date here and see a pile of newspaper closures in 2023: https://en.m.wikipedia.org/wiki/List_of_defunct_newspapers_o...
Metromedia filed for bankruptcy and shut down all papers in August 2023: https://montreal.ctvnews.ca/an-atomic-bomb-for-local-news-me...
Or how is the proportion of people who don't know that news content is blocked interesting?
Basically, this appears to be a study of data that was easy to get, not of data that could produce any kind of actionable insights for anyone.
In addition to the kind of data you asked for, data on whether use of FB/Instagram went down when the block was put in place would be fascinating.