Although he didn't analysed it very well, it's still his right. The details did seem a little poor, but not "terrible". Still, one doesn't have to do better to criticize, one has to understand what he is talking about.
Its only law that allows him to have the right
The fact that he shows no humility or appreciation for something he gets free and something he couldn't do himself is appalling
And that's my point if you don't have an understanding of how something works or take any consideration into what you're criticizing then you have no right
And I'm sure he didn't take into consideration every detail because maybe kishi drew that way to save panels
The drawings weren't that hard to interpret if you just look hard you can see obitos body mass is increasing and the support on his left arm fails
His left arm the bends forcing obitos attack to have a chance in trajectory avoiding Naruto and company but also connects on obito himself
The unclear part may be whether obito did this on purpose or not but that is a job for the translators
If you don't understand the translations given search for a better one which describes the events more effectively not to mention the manga scanning and editing can change the outcome image but I'm sure that wasnt taken under consideration before the complaints either
But whatever...