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Given the HRC's position on inclusion at the HS level, (inclusion w/o restriction - pic 2 & link), they were probably surprised Biden didn't explicitly prohibit restrictions in its Title IX rule change.
Beginning of his speech can be found at 3:22:40
https://twitter.com/oliverbrown_tel/status/1577349344143065101"The sport of rowing emphasises [...], the inherent physiological advantages enjoyed by men. It is one where speed is determined by the interplay of upper body strength, lung capacity and length of levers, all metrics that are influenced decisively by biology."
https://twitter.com/marymargolohan/status/1576719468188684288One allegation is the male student entered a room where girls were in a state of undress, when the girls asked for privacy, the male student entered anyway saying that it’s fine.
https://twitter.com/CEJacksonLaw/status/1569722859668504576

Reading between the lines in this and other policies supported by at least some of these Senators - they are almost certainly calling for a right for males who identify as trans to compete as women/girls, without restrictions other than self identification.
"The orders also reference "biological sex," a disputed term that refers to the sex as listed on students' original birth certificates."

Politico has released polling done on the topic of trans athletes & the women's category.