I don't believe this for a minute.
If anything "scares the crap" out of our Delta Forces, we are truly lost.
Remember this fact of warfare. The first time you're shot at for real, it's scary. The second time it's not so bad. After 20+ years, it's just another day at the office.
For all the training the Delta Force has had, it has precious little real combat experience. The Taliban has been at this for 20+ years.
We're going to have to win this war the way wars are won. By the sustained use of massive force.