Docs Clarification - Isaac SDK and Threads

In “Understanding Codelets” section of the developer guide, there is this paragraph:
“Always use blocking communication with hardware instead of threads, if possible. Isaac SDK automatically the necessary threads.”
What does is the meaning of the second sentence?

Hakiwen, please refer to the corrected documentation of Isaak SDK 2019.2 which says:

“Always use blocking communication with hardware instead of threads, if possible. Isaac SDK automatically creates and manages the necessary threads.”