AI Models Experience 'Cognitive Decline' As They Age: Study

"LLMs performed poorly on tests designed to check human cognitive decline implies AI models having cognitive decline. No, we won't talk about what we mean by AI models 'ageing', except in the heading."
 
In the grand internet tradition of links posts, haven't read the article and going solely off the headline, but doesn't giving them a test to measure cognitive decline assume they were capable of cognition in the first place?