Probably not Uchida as they aren't credited in the gengashuu despite the 3rd cut being in the book

Edit: Looking again the genga is a good match for their other work at this time period though, just something to keep in mind seeing as the gengashuu has some questionable crediting

It's Uchida, he shared the clip on twitter according to the blog + handwriting and credit order matches

https://blog.sakugabooru.com/2017/08/26/my-hero-academia-production-notes-31-33-s2-18-20/