As I see it, either his report is solid and contains no factual errors or incorrect assumptions (and thus is "engineering quality work") - in which case since i

As I see it, either his report is solid and contains no factual errors or incorrect assumptions (and thus is "engineering quality work") - in which case since it's correct then there should not be any issues in following its conclusion. Or alternatively, his report contains fallacies and invalid conclusions - but by extension is no longer of engineering quality.