The indication of the culture for me is pretty clear from the followings:

- no indication in the post that they going to hire a new person

- If your company IT infra is down, you are probably dead in the water, leaving it to be managed by a single person who does not have any IT infra management experience is a pretty bad business decision

- No indication in the post that the person offered any training or anything

- my experience with 1 person responsible for IT support/management/sysadmin jobs are that they are 24/7, which leads to burnout and mental health issues