The dates are also interesting. "The EU lawyers asked for a decision before the end of June to make sure missing doses could be delivered in a timely fashion"
The UK is hoping to have finished its rollout to all adults by mid-July, and most of the last month of rollout will be to the under 30s, so won't be using Az anyway. By the time judgement is delivered the UK will have finished with Az for first doses, and will really just be mopping up a relatively small number of remaining Az second doses, at least some of which will already have been stockpiled.
Let's assume that timetables don't slip (rare in my experience of lawyers) and that the court awards the EU full access to the supply from UK factories. So a resounding victory for the EU. It gets them those doses maybe three or four weeks sooner than it would if it just let the distribution play out naturally.
The UK production is say 2.5 million doses a week. If the EU gets everything it is requesting from the court, it might gain them a total of say 10 million doses.
And that's assuming there's no appeal, and no counterclaim through the UK courts, which would inevitably cause delivery timetables to slip.
Whatever this is about, it isn't about procuring meaningful quantities of vaccine.