I don't know of anyone ever crediting Trump with making the video. I believe it's been making the rounds on Nazified social media circles for a while.

The White House's claim is that Trump didn't post it, a staffer 'mistakenly' did so.

Y'all are giving that moron too much credit. Trump can barely put together a sentence. There is no way he did any sort of video editing.

I thought it was pretty clear that some other wacko was in charge of Donald posting. Especially since this was said in several news articles.

His twitter isn't actually him posting, but he does verify it. Its just misinformation to be saying that he writes all this shit while he can't properly form syllables.