You have been misinformed. Noah Igbinoghene got very few opportunities in his rookie season, let's see how he goes in year 2 (the season when most players make their best progress) before he's declared a bust. He's still just 21 years old, which is younger than most of these CBs preparing for the coming Draft. From the video, he looks in great physical shape. Also great to see that he's tapped into X's offseason training regimen.
BTW - if you think he looks quite athletic, just a reminder that both of Noah's parents were Olympic athletes who represented Nigeria.