Looking at his progression, everything checks out. No unnatural bumps in performances, and has been immensely talented since high school and before. His physique is absolutely attainable naturally, let alone for an elite athlete with elite genes. His parents both competed in track, and his dad won a gold medal in the 4x400m at the 1995 WCs.
Obviously it’s tempting to say that all elite sprinters are dirty, but Noah checks out in terms of everything that would give him the benefit of the doubt. Bolt, while never having tested positive, did indeed suffer from unnatural progression, particularly in the 100m, but also in the 200m. Of course, we’ll never know for sure, and Bolt is innocent till proven guilty, but Lyles seems like the fastest natural ever