I couldn't find anything about him being involved in the hip hop exhibition specifically, but he exists, he's a curator, and as an example for his involvement, I found a tiny article he wrote called "lowriders and hip hop culture".
No proof, but what kin wrote sounds plausible.
EDIT: Everything I can find points to him having a music focus:
https://music.si.edu/dr-kevin-strait
http://si.academia.edu/KevinStrait ("A Tone Parallel": Jazz Music, Leftist Politics, and the Counter-Minstrel Narrative, 1930-1970)
http://magazine.wesleyan.edu/2014/07/16/collecting-history-kevin-strait-97/
But nothing that references hip hop specifically, unless I missed it.
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