Last I checked 'mulls' means 'thinking about it'.
Also quote 'Emirates, the world’s biggest long-haul airline, is looking at grounding the bulk of its 115 Airbus SEsuperjumbos as the coronavirus undermines global travel demand, people familiar with the situation said.' unquote. Firstly it's not an official statement.. just a rumour...(perfectly acceptable in this forum!). Secondly I bet every airline that operates A380 (and the B744/748 for that matter) is 'mulling' over this.
Anilv