A big thanks as always to all the devs that keep this up and running.
While some Delta itineraries are working properly for me, I can't get this one to work through the script, even though it is easily bookable on Delta.com.
In this particular case, I think the issue is the "&cabin=BASIC-ECONOMY" part of the URLs being generated. If you change this argument to "&cabin=MAIN" the fares show up correctly for your trips on Delta.com.
For kicks, I just tried this switch on a purely domestic fare where BE fares are available. As expected, if you use the generated link with "&cabin=BASIC-ECONOMY" in it, the BE fares will be shown on Delta.com even if you have excluded them in your ITA search. Using "&cabin=MAIN" brings up the non-BE fare on Delta.com