See Does an unbalanced sample matter when doing logistic regression? where most is answered. Unbalance in itself is not a problem, but only 42 'true' with 4 predictors is on borderline. The wikipedia quote seems somewhat imprecise, but not wrong. This posts give more information.
The 'rule-of-10' you refers can be criticized, see Sample size for logistic regression? and also Sample size for logistic regression?, especially F Harrell's answer, where references are given.
