Channel names are unique but the channel display name is not. If you click on the channel you will see that the channel name is "@TesIa-Musk" and its identifier is "UC4NV-QGBa5ZtMxAvc-xxSRw", which is an unique ID that persists channel name changes. Searching historical youtube metadata for that ID reveals that the channel used to contain some random Indian songs [0]
The youtube accounts used in these scams are typically from victims of info stealer malware that has compromised their google/youtube cookies and / or passwords. It is baffling how often these Tesla or Elon musk scams gain algorithmic traction and at worst it can take hours until they are deleted. At the very least they could add some warnings if the name of a high sub count channel was recently changed.