No. A partition table is a small binary file that sits at the beginning of every disk drive. It serves as a "phone book" for your operating system so that it can find the right sectors to load a file system from.
Because of that, removing the partition table will not delete any existing data inside your hard disk. To properly remove the data inside your drives, you can "zero" its contents by piping "/dev/zero" to your device file using dd: sudo dd status=progress if=/dev/zero of=/dev/sda.