You aren't describing systematic bias. Systematic bias is when the
results are skewed by either selection of inputs or by the process
applied to inputs. The wiki process realizes that individual editors
have POV. The solution to use of non-POV phrases is not to proclaim
systematic bias, which you have not proven by showing a statistically
significant skew, but instead to go in and edit them.
The time you spend haranguing people on information which is already
available, specifically that the English Wikipedia has a cultural bias
because of its user base - could have been spent engaging in the
process itself, namely to converge on a consensus result which is the
best article which we can produce.
There is a huge amount of work to be done, might I suggest that you get
to it?
(Grumbles and returns to editing his own book.)