I think Bridenstine regrets having made that tweet yesterday.

He later shared another tweet from Eric Berger of Ars Technica:

https://twitter.com/SciGuySpace/stat...11302296395776

Eric Berger
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I would not read this as a shot to SpaceX, but rather a reflection of Jim's desire to see all NASA contractors meet their deadlines for government contracts.
I think the press is blowing up Bridenstine's tweet in another fit of wanting to make the Trump administration look bad, and, frankly, he could have worded it it much better.

When Musk was asked about it on CNN, he had the best response:

"Are you sure he wasn't talking about SLS?"