No, Partial Reconfiguration has never been supported in Arria® V devices.
Some typographical errors have been detected and are now corrected in the Arria V Device Overview from document version 2020.11.20 onwards.
Due to a problem in the Intel® Quartus® Prime Standard Edition Software version 20.1.1 and earlier, you may also see a ‘false’ successful design compilation when implementing Partial Reconfiguration (PR) targeting Arria® V GZ devices.
This problem is fixed beginning with the Intel® Quartus® Prime Standard Edition Software version 21.1std where a warning message is generated when initiating PR features targeting any Arria® V family, including Arria® V GZ devices.