Let us know the results. Many on the NodeRed forum are also here.
I don’t know why it would be wrong to ask an Node Red question since there are 18 nodes that are exclusive to Home Assistant. If you ask a question in Node Red forum about one of these nodes, someone will say “What?”.
because in case of post you are referencing, NR reads data from MQTT. The MQTT is not HA exclusive. Reading and processing data from MQTT is not HA dependent.