I clicked on the source and it told me it was deleted. So presumably, either it actually is deleted, or you've run into the issue that Twitter has been having for the past few days, which is rendering random tweets as deleted for no discernible reason (probably backend shit). Unsurprising this would also cause issues for Danbooru.
If the tweet is still visible to you, try uploading the image by itself to Danbooru (changing whatever the URL is at the end, probably ?format=[format]&name=[dimensions]
, to .[format]:orig
), and manually copy over the rest of the stuff from Twitter, like the commentary.