Not all polls are the same.
Look at it this way. Almost all the other polls are from deranged Trump hating outfits like the New York Times, CNN, ABC, NBC etc.
Now I don't trust any news from the these guys. They have repeatedly proved they will lie, cheat, make stuff up to try and destroy Trump.
If I don't trust their news, why would I trust their polls?
The Express is a more conservative newspaper though much less conservative than they used to be. They don't have a history of rabid Trump hatred. For that reason alone their polls are far more believable than CNN or the New York Times.
Not to mention they still had Trump at only 47% approval, which was about the same as Rasmussen at the time.
Why trust any polls? If the polls from Trump haters are biased against him how do you know that polls from Trump supporters are not biased for him?