However, Gilead apparently received the WHO study on 28 September and so were aware of the conclusions of the study before they signed a deal with the EU Commission.
This naturally leads to further questions, as discussed in this tweet thread:
https://twitter.com/kakape/status/1317042940825436162
Edit: Martin Landray, professor of medicine and epidemiology at the University of Oxford and leader of the UK-based Recovery trial also has a good summary of the WHO trial:
https://twitter.com/MartinLandray/status/1316989951297396736