Tony - I'm reading it as the US putting an extra bit of pressure in doing what they can do to stop the flow of US dollars to Cuba given Castro's current state of health, and the possibility of their being a change in the guard in Cuba. To me - that would mean not only increased scrutiny on those traveling to countries that sell the evil Cuban product. I would also venture to say it means there will be increased scrutiny of those outside of our borders that are shipping into this country.
So - how do you fine a website that is shipping to people in the US? I'd say it would be difficult at best. Call me paranoid, But I envision it being much easier for the US to impose stricter penalties on US residents caught dealing with those outside of the US than dealing with the purveyors of the websites. Imagine the effect that would have on the purchasing of Cuban products...
Only time will tell, though...