Portability between different computers is only a secondary reason for the Z-machine. The most important reason is code size, making the largest possible game that can fit on a floppy disk.
Are you confusing Motorola Mobility with Motorola Solutions? The article is about Motorola Mobility, which makes cell phones. Motorola Solutions makes two-way radios and surveillance systems. They split in 2011.
Also, the original title is only 77 characters long, so there was no reason to change it. And the title should never be changed to something that misrepresents the article.