I agree. "production system" isn't a useful term without context.

Either it's production system in the context of "it's a business serving customers", in which case, there are many homelabs out there which have received paying traffic, or it's a production system in terms of functionality, downtime, technical features etc. Again, there are many homelabs out there that can tick all the same technical and performance boxes as "production system".

In the context of the original comment I was responding to ("...running and managing numerous DBs, k8s clusters, ci/cd pipelines and stateless container systems is simply impossible with a team of 1-2 people.") you're more evidence for my comment that it's perfectly possible for 1 - 2 people to run a small production system, just as it's possible for 1 nerd to run a medium - large homelab with the same technical features.