I don't know why this 'dry pylons' rumour keeps resurfacing, hopefully this reply may kill it off.
because a DoD contract update, which I have posted a couple of times but cannot locate at the moment, stated specifically that qualification of the wing pylons to carry fuel tanks was deleted from the test programme.
It didn't state state whether that was because of time, because they it was no longer required, or because they were taking out the piping for weight reasons etc. But I assure you the contract amendment was published.
If you can categorically state it is back in the programme, and where it was added back in, I will, as stated in my previous post, be more than happy to be disabused.