No, because buttermilk is prepared during butter production.
Roughly explained:
This involves whipping cream (cream or sour cream) vigorously so that the egg white shells around the fat globules burst open and clump together to form butter granules. These are kneaded and the liquid that emerges is the buttermilk.
The slightly sour flavour and somewhat thick consistency of buttermilk made from sweet cream is achieved by adding lactic acid bacteria to the buttermilk, which do their work at room temperature. You don't need a yoghurt maker for this.