Unsurprisingly, Lores' claim comes from HP-backed research. The company's bug bounty program tasked researchers from Bugcrowd with determining if it's possible to use an ink cartridge as a cyberthreat. HP argued that ink cartridge microcontroller chips, which are used to communicate with the printer, could be an entryway for attacks.
As detailed in a 2022 article from research firm Actionable Intelligence, a researcher in the program found a way to hack a printer via a third-party ink cartridge. The researcher was reportedly unable to perform the same hack with an HP cartridge.
Shivaun Albright, HP's chief technologist of print security, said at the time:
"A researcher found a vulnerability over the serial interface between the cartridge and the printer. Essentially, they found a buffer overflow. That’s where you have got an interface that you may not have tested or validated well enough, and the hacker was able to overflow into memory beyond the bounds of that particular buffer. And that gives them the ability to inject code into the device."
This is a remarkable amount of effort and money to spend trying to demonstrate the "truth" of something which everyone involved was surely aware was bullshit from start to finish. I'm honestly at a loss to figure out what was the point, unless the point was "help me help I have too much money what am I gonna do with all this money."
(I looked it up, and the bug bounty program awarded "up to" $10,000. So maybe they just made the guy sign an NDA then gave him $100 and said thanks for helping us with our lying sucker, now get lost.)