This tool does not tell the full story. It is just meant to be a reference for comparison so you can actually see what has less likelyhood.
For example a system that only requires 5 characters (7.7 billion possibilities) still has less possible passwords than one with 8 that requires 1 capital and 2 symbols(1.3 * 10^13 or ~13 trillion).
Likewise if you do remove all requirements, most users will just do lowercase letters, which means that a password of length 5 with 1 capital and 1 symbol (717 million), vs 6 characters all lowercase (387 million)