Hi @RajiitGct,
Thank you for your question! The excerpt that you mentioned is related to the event types being sent through the Account Activity API compared to Site Streams. When using Site Streams, the API would deliver activities related to accounts that the subscribed account follows. Here is an example: I am tracking account activity related to my personal Twitter account. On said account, I follow @jack. On site streams, I would receive events from Jack’s activity, On the Account Activity API, you will not receive these events.
Please let me know if I can clarify further.
Best,
-Harrison