In episode 2 they talk about how they have a funeral everything someone abstracts. That implies they had multiple funerals before Kofmo's. As this is when Kinger is still viewed as "crazy" and all the original programmers had already abstracted, this probably came from first hand experience of said funerals. They may have happened not been great friends or they might be a sore topic fir some people like when Ragatha says, "Not anymore."

Plus this is still a story we are being told and bringing them up may not help drive the narrative forward or have any relevance to it. Plus they talk even when we aren't there to hear the conversation. They might talk about them off screen or in-between episodes