[i.h]

Where did you get that information from?

The transponders are all of varying ages and so will be under different contracts with different terms and different expiry dates and clauses.

They'll have had a choice of which one to give up and a lot of that consideration will be down to contracts and cost.

er... SES themselves?

www.ses.com 

Luxembourg, 22 February 2021 — SES announced today that it has signed multi-year capacity agreements totaling over EUR 66 million in backlog with multiple public broadcasters in Europe throughout 2020, enabling millions of satellite TV households across Europe to continue watching SD and HD content delivered with world-class reliability.

The public broadcasters who have signed contracts directly with SES include ARD and ZDF in Germany, BBC in the UK, BVN in the Netherlands, as well as TV5Monde and France 24 from France via its partner Globecast, strengthening SES’s position as the world’s leading global content connectivity provider.

...

The latest agreements signed between public broadcasters and SES illustrate how European broadcasters are leveraging SES’s satellites at the prime orbital slots of 19.2 degrees East and 28.2 degrees East to reach more than 89 million satellite TV homes, surpassing other satellite or terrestrial operators.

I'm sure you have about as much first hand knowledge as I do in regards to the BBC's commercial agreements and what the details are - ie not much - but SES seemed pretty pleased with the outcome. "to continue" implies renewal of existing agreements.