It doesn't matter because you wouldn't be able to A/B in a blind test Apple's 2020 version of 256kbps AAC files vs lossless files anyway. Say the dozens and dozens and dozens of blind A/B studies that have been done to that effect.But if apple hasnt changed anything or offered an hd version of aac then the likelihood is very low.
What you can clearly hear though are somewhat small variations in dBs even for a rather narrow range of frequencies. Hence why you should care first and foremost about the frequency response that lands at your eardrum.