The MMC command op code 43 is "Read TOC/PMA/ATIP" and yes it is a way to read the ATIP. Reading ATIP is not a restriction of the software* on the PC, rather it is a restriction of the drive's hardware/firmware.
Most DVDROM/CDROM readers are designed to not support such commands in their hardware/firmware.
*Unless it was intentional by a tray program.
PS. Not to be bad, but you shouldn't hijack this thread, in future, instead you should create a new thread.