in the Help https://support.salesforce.com/articleView?id=customize_recordtype_considerations.htm&type=0 it says "Deleting a record type also deletes the related path." What does that mean?
There is a metadata type named 'pathAssistant' which is related to a specific Record Type. Deleting this Record Type would delete the associated pathAssistant. (the process graph you can see on opportunities)