They are just trying to get ahead of Trump taking credit for the new jobs, like he has done repeatedly since he was elected.

Edit: Haha, never mind, looks like the Trump Administration is already taking credit:

"The announcement was made after the president-elect met with heads of several other tech companies and urge them to keep their jobs and production inside the United States," Sean Spicer, the incoming press secretary, said on a call with media outlets Thursday. "The president-elect was pleased to have played a role in that decision by Amazon."

https://www.bloomberg.com/news/articles/2017-01-12/amazon-to...