What exactly does the resent Trump EO reversal of LGBT rights do?

In Altitude Express the SCOTUS said an employer cannot discriminate against an employee for sexual orientation or gender identity because “sex” within the 1964 Civil Rights Act implies protection of sexual orientation and gender identity. My question then is what good did Biden EO do, if anything? Since it seems this issue was settled by the SCOTUS during Trumps first term? And further what does Trumps reversal of Biden EO do, if anything?