I picked this up too: a minor error in an excellent article.
She never even mentions the ultimate cause of the crash: Antonov's design required dual grounds, but the factory in Poland modified the design to group the grounds together, without realizing or caring about the implications.
It's right in the UK DoT crash report - page 30 - and on the summary of the crash on the BAAA's website, which is in the first 6 google results for the crash. It would probably be higher except her article and copies of it on reddit are taking up the first couple of hits now.