I think Arsenal can win both the Europa and Premier League all the need is more more good games and consistency. They maintained a good performance and stat in the premier league as well as Europa in the early games of the season. The remain the favourite to win the Europa but for the PL the will have to maintain the point difference the have over Manchester City because Pep is cooking up some new tactics to test them once the season resumes.
This can indeed still happen but in the current conditions winning the European league and EPL clearly requires a very big effort for them even though at the moment their consistency is still maintained but we also know that Arsenal sometimes change from time to time and cannot be predicted so this it can still happen but quite difficult in my opinion.