Easy solution
"hackers can exploit a "vulnerability where the supply chip meets the printer""
The obvious way to prevent hackers from exploiting the DRM chip would be to not have the DRM chip.
Aside from that, there's an interesting question to be asked about how locking down printers from using third party supplies interacts with right to repair laws. Is there anything in said laws distinguishing consumables like ink from other parts? If my printer stops working, it shouldn't matter whether that's due to a part with a known lifetime or a part that was expected to last for longer, I should be allowed to fix it using whatever third part services I like and not be locked into using only one provider. With a lot more focus on right to repair at the moment, I can't help wondering if HP can see the writing on the wall and are changing their game now before an expensive lawsuit forces them to do so.
Biting the hand that feeds IT
