With all due respect, if you're not familiar with the concept of voice in linguistics (which has a particular technical definition, and makes no sense to apply

With all due respect, if you're not familiar with the concept of voice in linguistics (which has a particular technical definition, and makes no sense to apply to a purely adverbial phrase like "surprisingly" or "to our surprise"), maybe you should read up on the concept before trying to determine the difference between active vs. passive.