These instructions are correct.
Normally for script based operations you would generate a Client Credentials token as outlined here
But the type of token needed will depend on the endpoint you are calling, for streams/followed you will need a user access token with permission from the user 141981764 to read their data
Which is This kind of token instead
or
If you followed the guide and generated a token, you generated an App Access Token.
An App Access Token cannot be used to call the streams/followed API that needs a user token
With the scope user:read:follows
This will require a webpage that you redirect the user to, to grant permission between their account and your own ClientID