That's a different measure! It's detected by some software in photocopiers or software used in conjunction with scanners, not produced by printers.

The other reason I had thought why inkjets were considered a lesser concern for counterfeiting is that the documents they produce will traditionally smear if they get wet, which doesn't seem like a very desirable property in counterfeit currency and documents. Maybe over time they've tended to use more permanent inks, though.