Will this fence provide good wind resistance? (And is it a correctly built shiplap fence?)
If you mean will it block wind, then yes &amp; quite well. If you mean will it hold up in the wind, as you indicate in comments, then yes it will but not long. However, the construction problems you mentioned don't have me convinced either that the boards will stay on past 5-years. Amongst many other components, due to that haphazard nailing.

2 other concerns are that it's seated on the ground &amp; the bottoms (&amp; up to 3') will rot out &amp; look like termite damage in under 10-years...wetness wicking already witnessed by the camera. And, being over 6' tall is likely a local code violation. Which, frankly is a good thing because it's your only possible avenue of recourse in getting it removed or at least done a little closer to right.