The request from March was sitting around for a while with old info. Keep in mind it was less than two months since Trump took office and they pretty much rubber-stamped it.
On the DOE taking offense to them saying, "need not consider blah blah" and that's the reason for the delay, seems like a reach and too petty for something so small.
No one knows, but either more info was needed on the new design or the lawsuit to some extent seems like the likely culprit for it to go on this long. Just my best guess
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