That buzz has only grown

Does "that buzz" refer back to the criticism ("Some critics have called the former California attorney general overly self-seeking")?

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Those concerns have been revisited by pundits, in workplaces, and across dinner tables with former Vice President Joe Biden’s choice of U.S. Sen. Kamala Harris as his running mate on the Democratic ticket. Some critics have called the former California attorney general overly self-seeking. That buzz has only grown as Harris, a former prosecutor, gets ready to take on Vice President Mike Pence, in Wednesday night’s vice presidential debate.

Source: The Harvard Gazette
https://news.harvard.edu/gazette/story/2020/10/study-finds-american-voters-dont-hate-ambitious-women/?utm_source=twitter&utm_campaign=hu-twitter-general&utm_medium=social