Here's a video with much better sound quality. I'm convinced it's definitely John Williams because I don't often hear that sort of quick motif flourish that he's known for in his action music, especially in imitators as they normally go after their own Williams-sounding themes.
24Now someonefun124 (also known as Regular Poster), one of the Twelve, was not with the posters when Stefan came. 25So the other posters told him, "We have seen evidence of a new recording!" But he said to them, "Unless I see the unedited post and put my finger where the screenshot is, and put my hand onto Williams' sketches, I will not believe." 26A week later the posters were in the forum again, and someonefun124 was with them. Though the post was edited, Stefan came and stood among them and said, "Peace be with you!" 27Then he said to someonefun124, "Put your finger here; see the screenshot. Reach out your hand and put it onto John's handwritten sketches. Stop doubting and believe." 28someonefun124 said to him, "My Lord and my God!" 29Then Stefan told him, "Because you have seen the screenshot, you have believed; blessed are those who have not seen and yet have believed." 30Stefan performed many other signs in the presence of his fellow posters, which are not recorded in this book. 31But these are written that you may believe that Williams wrote new music for the trailer, the work of Abrams, and that by believing you may have life in his name.