Is XKCD Password Strength true?

Related questions

1. Why is Xkcd called xkcd?
2. How many characters is a secure password?
3. What makes a secure password?
4. What was the first webcomic?
5. What is a high entropy password?
6. What time does Xkcd update?
7. What is proper format password?
8. How secure is a 12 character password?
9. What does a secure password look like?
10. Is using 4chan illegal?

Tags

1. #being
2. #confirmed
3. #strong
4. #things
5. #strength
6. #other
7. #think
8. #certainly
9. #absolutely
10. #because
11. #checker
12. #passwords
13. #remember
14. #length
15. #password
16. #equal
17. #people
18. #rumkin
19. #tends
20. #using
21. #safer