Yes, broadening participation remains a vital component of the NSF's Broader Impacts criterion, and can still be used as part of Broader Impacts plans. However, per NSF’s updated guidance, your activities and research "must ensure that all outreach, recruitment, or participatory activities in NSF projects are open and available to all Americans."
NSF further clarifies in Section 35 of its terms and conditions the following: "...award is subject to the provisions of Title VI of the Civil Rights Act of 1964 (42 U.S.C. §§ 2000d et seq.), Title IX of the Education Amendments of 1972 (20 U.S.C. §§ 1681 et seq.), the Rehabilitation Act of 1973 (29 U.S.C. § 794), the Age Discrimination Act of 1975 (42 U.S.C. §§ 6101 et seq), and all applicable regulations and policies issued by NSF or cognizant Federal agencies pursuant to these statutes. Specifically, in accordance with these statutes, regulations and policies, no person on the basis of race, color, national origin, sex, disability, or age shall be excluded from participation in, be denied the benefits of, or otherwise be subjected to discrimination under the award. "
This means that if you plan to have activities aimed at broadening participation, they must be open and available to everyone, and not focus on groups defined by protected characteristics (e.g., race, ethnicity, sex, etc.). NSF recommends that you design opportunities to be broadly accessible while allowing for efforts to build capacity in STEM fields without implicitly or explicitly limiting participation based on a protected class.