I suppose they might have used the common mysql instance for containerized infrastructure, or a crufty base image for their container(s)... But you do raise a pretty good indicator that at least a key thing is not running in container.

But I'm not going to judge too hard on container/no container. The vintage of the platform is broadly problematic either way. I've seen particularly in enterprise IT some shockingly old container bases, with teams unwilling to refresh those because 'they work'.

In fact, teams that once would be forced to rebase their crufty dependencies ever so often because they were bundled with an unacceptable OS, now gleefully push their ancient 12 year old stack because containers let it keep running no matter what kernel is running.