This feels like a realistic result; albeit disappointing. One would expect a poll like this if this is a narrow cruz win by 4/5 points to balance out the Cruz+1/2/3 polls.
Regardless, Atlas will now treat this result as the new standard and act as if the dynamics of the race have changed. Until we get a Cruz+2 poll by literally any pollster at which point everyone will act like it's a horse-race again.
I suppose it could be an outlier.
It is, however, the only poll we have taken after labor day (which we know a lot of users around here value more than August polls). There's also the fact that far more voters are familiar with O'Rourke now and he still hasn't gotten more than 45% in a poll. So, for all we know, these could be the new dynamics of the race.