[singlow]

Agreed, syntactically. However, it is passive in that the strategies aren't actually the actors. The word _evolved_ has a general passive use while actually retaining the active voice syntactically. The actual passive voice version you gave is not normal usage. The author is the actor who has developed strategies, but he is dodging the responsibility by making the strategies be the subject of the sentence and leaving himself out.

[kixiQu]

The "passive voice" is a term with a technical meaning in grammar. "Evolved" used intransitively doesn't qualify. This is the kind of thing an ordinary person mostly shouldn't need to care about, but if you're going to reach for the cutesy editor joke...