I'm already on the newest BIOS for the board, which is from late July.
Analyzing the issue further, I tested several other monitoring softwares in the past week (hwinfo, hwmonitor, LibreHWM (https://github.com/LibreHardwareMonitor/LibreHardwareMonitor )).
None exhibit the issue. This needs a fix from the AIDA Developers.
Realistically I don't see ASUS updating all the BIOS for their several dozens of AM4 boards, for one bug in a niche software (to be frank, the notion seems borderline delusional to me).
Making things worse, not only is the temperature reporting inaccurate. A64 makes the board see the negative temperatures as the real measurements, which leads to fans that are throttling to a minimum. This bug seems extremely severe, we are talking about a monitoring software sabotaging the cooling on a system, which can lead to system instability and in extreme cases hardware damage.