CERN is of course a massive organisation where people use lots of tools. But the annoncemnet you posted is from 2011 and CERN started using KiCad some time later (2014 or so). And there is definitely some advanced stuff they are working on that is done in KiCad such as Macbeth [1]

They also have a service contract with KiCad Services Corporation. [2]

[1] https://ohwr.org/project/macbeth [2] https://cernandsocietyfoundation.cern/news/significant-miles...