Yep.
I think all or most new hires since 1990 are under FERS.
I think you are right about the 1990 date. Mine was hired in 1982 and had the option of switching, but didn’t. Tough to tell if he made the right choice sometimes.
I believe all federal employees hired after 1984 are under the Federal Employees Retirement System (FERS.) Those hired prior to 1984 had the option of staying under the Civil Service Retirement System (CSRS), or switching to FERS. Most stayed with CSRS.
(Yes I am a federal employee, and no, I don't make anything close to $149,000 per year.)