if you go to the message link in the original article you can hover over it and it says "Mail on Sunday" a newspaper
message embed:
https://cf-particle-html.eip.telegraph.co.uk/96a96c7f-1497-41fa-8711-7607b79f55e1.html
article:
https://www.telegraph.co.uk/news/2023/03/04/project-fear-covid-lockdown-files-matt-hancock-whatsapp/