Is this the case for each university or just one/a few? Looking at
a document targeting last year's year 12 applicants, UAC states the following:
"Institutions have released the lowest selection rank required by 2021 Year 12 applicants for entry into each course."
Based on this, it is possible that some universities may have not yet released 2022 ATAR profiles for their respective degrees/programs, which would be the reason that UAC is yet to display up-to-date information. An example of this is UNSW, which still displays 2021 data on its Admissions Information page (which is also reflected on UAC's website as a result).
Regardless, it is likely a matter of time before all universities provide up-to-date ATAR profile information regarding their degrees for this year's year 12 applicants. Once this occurs, UAC will then update its information accordingly.
I hope this helps!