It’s not that I am familiar with the subject matter- i am just applying basic legal reasoning to the situation.
What is the prohibition specified in section(a)?
Whatever it is, the section you cited states it is inapplicable as it pertains to those contracts that MAY not be enforced in a US court.
The use of “may” is tricky. There may be another clause that specifies the contract wont be enforced in a US court, but if not, then “may” leaves an opening (compare if it said “shall” or “shall not”).
I hope this helps. Legalese isn’t always straightforward, LOL.
It’s from the actual amendment, which I posted here:
http://www.freerepublic.com/focus/news/2357517/posts?page=46#46