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This is very possible after seeing Liverpool's performance at the start of this season, they have really improved and are much better than last season, but winning the Europa League is not easy, in this competition there will be many surprises like what happened to Arsenal this season. Then, they are very strong in the domestic league but they can't go further in the Europa League, the same goes for Liverpool this season, indeed they are very favorites, but it's not easy.
Winning the title is not easy for any team even if they are favorites, that's true and I agree with you.
Liverpool is one of the favorite teams to win the Europa League title this season, but I can't predict for sure whether they will be able to reach the final or fail sooner in the knockout stages. Something like that is always possible as experienced by Manchester United and Arsenal last season.
Several teams that failed from the Champions League cannot be ignored. They tend to be stronger than the teams that qualify for the knockout stages and we don't yet know who Liverpool's opponents will be there even though Liverpool are leading the group stage standings so far.