Yes..That because samsung trying to force customers to buy new devices..Bcz A52 & A52s have massive fanbase bcz of Qualcomm processor, samsung wants those users to move to their exynos processor.
Its true what u said.. but samsung early announced the above features is for a53 and above only.Oneui 6 changelog for A series is only same for a52s & other A mid range devices too.Even u see a feature in changelog that doesn't mean ur device will ge...