One argument that I’m missing in the article is that with an enumerated, states are mutually exclusive, while withseveral booleans, there could be some limbo state of several bool columns with value true, e.g. is_guest and is_admin, which is an invalid state.
In that case, you set the enumeration up to use separate bit flags for each boolean, e.g., is_guest is the least significant bit, is_admin is the second least significant bit, etc. Of course, then you've still got a bunch of booleans that you need to test individually, but at least they're in the same column.
look up the typestate pattern.