Who, Sir, They Sir? No Sir, Not They Sir!

My friend Larry laments over the future of the language, or at any rate, the absence of grammarians from the NYT copy desk:

Six years ago, he met Teresa Hillary Clarke at a party on Martha’s Vineyard in Massachusetts, where both spent summer vacations with the same African-American crowd, many of who, like they, went to Harvard, teach at Harvard or have children studying there.

From the Times'Sunday wedding feature. Who, they?