Interesting. Neither of us has access to a limited purpose FSA (I am not 100% about H's, but if he did, it would be a nice surprise).
I am hung up on the "post deductible" language because in my plan, LASIK doesn't count toward the deductible at all. If I have no coverage for that procedure and it is an unqualified medical expense, the FSA shouldn't be deemed "other coverage" for that procedure. For argument's sake, if I reached my deductible first (using qualified medical expenses) and got LASIK on top of that, then I could use my spouse's FSA for that procedure? That doesn't make sense - in neither situation do you have "other coverage," so the result is the same, effectively.
We'll check with H's employer, but I have my doubts that they will know the answer. And, in any case, we would be using his FSA funds first and my HSA funds second so I don't know which employer needs to weigh in here (my plan didn't know and told me to contact H's plan).