Nope. Different height, different build, darker skin tone and different facial features. Outside of that it is the doppelganger that you saw.
Also, the Twitter post does not identify him as Kaep, nor does even one person in any of Twitter replies. No one on this planet has claimed that is Kaep in that video outside of you (and you say that is based on something you read somewhere that you can't find the link for).
Also, it makes no sense that Kaep would attend a Rams game wearing a Ram jersey with his name on it, particularly since he never played for the team. Not to mention sitting in the bleachers with the fans.