I set the cron job, yes. But I set the cron job to the URL your specified, which runs the code you set up on that URL. If that code so happens to be using a lot of CPU power to do it’s work, you may hit the CPU usage limits.
Looking at your original post, it does seem I was a bit careless in setting the timer of your cron job, which I set to once every 5 minutes instead of once every hour. Changing the timing may help there.