The official report says the controller told the Ryanair flight to stop descent due to a
potential loss of separation with an Easyjet aircraft. That's all. There's no suggestion that "the Ryanair aircraft was just 1,000 feet from colliding with an easyJet plane" – that's just the usual silly journalistic over-excitement. The reason this was investigated at all is the injury sustained by a passenger.
AvHerald's account doesn't mention Easyjet at all:
Accident: Ryanair B738 near Fuerteventura on Feb 10th 2018, passenger injured by stopped descent