I know a couple of non-technical founders who were forced to learn how to code when their CTO left company for unfortunate reasons. Those founders not only kept existing service up and running without any downtime but also rewrote code from scratch if necessary.
Some even did entire migration from on-premise hardware servers to AWS cloud just by himself, which includes Linux configuration, application deployment and so on. Again, those founders are not technical, but they did it anyway just to keep their company alive. So nothing is impossible.