What business does an ink cartridge have containing any significant code that could act as malware? What sort of imbecilic or evil (or both) personage designs a system that makes this even remotely possible and then sells it to the general public?

Of course there is no answer to that because it isn't a real reason, it is crap regurgitated by a PR drone who knows next to nothing about tech details and has been told to drop the phrase in to make it look like the company is defending their customers from something rather than being a something their customers need defending from…

(or worse, the PR person knows a bit about tech, so knows the malware angle is complete bunkum, and was actively lying.)