Yes. Macs that are based on x86 architecture can be erased with Blancco Driver Eraser. If the Mac computers are based on PowerPC architecture (for example G-series models), then booting the Blancco Drive Eraser client software is not possible. The hard drives can be erased by removing them and plugging them to a x86 based hardware and starting the Blancco Drive Eraser there.
Note that Apple computers do not, in most cases, support the PXE/network boot method. The easiest way to erase an x86 based Apple computer is to boot them from a CD or USB.
You can find more information on how to erase Apple machines from the article: Erasing Apple computers with Blancco Drive Eraser / Blancco 5