"celebrated diversity" is your take; mine is that it exploited little people like a freak show. I flipped between that an PBS and was generally just as appalled by that as by My Big Fat Obnoxious Fiance and Average Joe and the Bachelor/ette. They all have "diversity."
The BGOF: a money-grubbing girl who "feels bad" about the trauma she puts her family through and in the end says she did it all "for them." Basically the producers took an unwilling family and embarrassed them on national television by pairing their daughter with an obnoxious man, totally opposite from her (though he was an actor in the end, I believe I heard). That's "diversity" between her classiness and his lack thereof, but money's still the bottom line.
Average Joe: It's not "diversity" that tricks the girl into thinking she's meeting good-looking guys, and it's not "diversity" that makes them bring in a bunch of good-looking guys later to compete with the Joes, just as it's not "diversity" that makes the producers of The Littlest Groom bring it a bunch of beautiful tall women to compete with the shorter women who by society's standards aren't as "beautiful" (though I did think they were fairly attractive).
And then there's the "diversity" on The Bachelor or The Bachelorette where they provide the token black/asian/hispanic people who get voted off, not in the first show, but in the second so that the Bachelor/ette doesn't look racist.
[insert embarrassment about having watched parts of all these shows]
Had I watched more of the littlest groom, I might have seen the show celebrating diversity, but I didn't. Perhaps I didn't give it a fair trial. But when money and ratings are the bottom line, I think exploitation is a better word.