Right, that’s exactly what the service I linked does. When you add an integration in Home Asssistant it creates a config entry. That’s how it keeps track of what integrations you have added to your particular instance and what values you entered for any settings of that integration. This distinction is also how you are able to add some integrations multiple times (multiple config entries for one particular integration)
Since that post about 6 months ago the service appears to have changed since then. It no longer accepts a config entry ID, instead it accepts the ID of an entity, device or area created for a config entry (i.e. integration). It then uses that to find the corresponding config entry and reloads it.
So you no longer need Node RED for this. Just go to the integration you want to reload with an automation and find an entity connected to it, then use homeassistant.reload_config_entry and pass it to it. You can also get device and area IDs in templates now if you prefer.