I asked my webhoster (one of the top 5 in world. Everbody knows who they are) about this, and below is his response. He is a: Linux Administrator / Network Security Administrator
This plugin is worthless, and is not designed to operate in our environment. I fail to see the logic in the statement that 755 is more acceptable than 750; 750 represents that world (ie, everyone but the owner and their group) have no permissions ( octal zero ) for that file/directory. suPHP (which we use in this environment for security) requires that public_html be 750 so that nobody but the owner and group membership members be permitted to descend into it.
Therefore to answer your question, yes, I can most definitely confirm, both from a logical standpoint and a systems admin standpoint that 750 is an infinitely better permissions permutation than 755, which would give read and execute access to world on the entire tree unless otherwise specified.