Vienna, It's a proposal that has some explanatory power. As he says unfortunately we have no ancient Hebrew versions with which to compare. Ultimately it doesn't matter as much as it seems. Once a variant text existed, readers understood the text differently. IOW, however the OG variant came to be (closer to original, scribal error, or theological alteration) subsequent readers would have seen the text differently...
You may have noticed this comment in the article:
We know that the language of Rev 1:13-14, where the exaltedJesus is called “son of man” but is depicted in terms that correspond tothe Ancient of Days of Dan 7:9 (“white hair”), was shaped by Dan 7:13OG, while other allusions to Daniel 7 – most notably in the Gospels – presuppose the clear distinction between the two characters found inthe Aramaic text and Theodotion.