Synthesized answer
The provided passages do not explicitly state what questions remain unanswered in the "Commentary on the Laozi (Daodejing)".
However, the passages do describe the "Classic of the Way and Virtue by Laozi" as the "most famous and influential Taoist text" and that it is "traditionally attributed to Lao Tzu, supposedly a contemporary of Confucius (551-471 B.C)" [1]. This provides context about the work but does not address any unanswered questions within it or its commentary.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: The Classic of the Way and Virtue by Laozi Description: The most famous and influential Taoist text, the Tao-te Ching is traditionally attributed to Lao Tzu, supposedly a contemporary of Confucius (551-471 B.C). Categories: History Pages: 260 Snippet: The most famous and influential Taoist text, the Tao-te Ching is traditionally attributed to Lao Tzu, supposedly a contemporary of Confucius (551-471 B.C).