I would say yes it is okay for Acoustic because Guitar Fundamentals branches out into Rock, Blues & Country style music, levels 1 & 2, after the basics.
You could always leave a message for Lisa McCormick, who specialises in Acoustic :)
Christopher Schlegel is also a very helpful, experienced instructor, too! He certainly knows a great deal about a variety of instruments.
Good luck finding what you're searching for.
Am I the only one who plays multiple instruments? Let's be inspirational and find our muses everyday!