I don't think these objects being real or not makes much (if any) difference to those who view the ad negatively. The underlying idea that Apple is crushing these tools of human entertainment and creative expression, only to replace them with their own "jack of all trades" remains the same.
Can confirm. I reacted negatively to the ad (in a "this ad causes emotions which the creators absolutely does not want an ad to cause" kind of way), and for me it's all about the imagery and symbolism. I hope and assume that the destruction is primarily CGI, but the visuals of destroying positive "soulful" things like instruments and replacing it with a lifeless slab of glass just doesn't sell the product to me.
In fact, I think this would have been an excellent art piece if the message was "heartless tech corporations want to destroy the good things in life and replace it with a cold slab of glass".
At first I had a negative reaction. Then, looking for comfort, noticed that the video is mostly CGI. But then again, I felt the same. It is what you say: the image of destruction of beautiful objects is bad per se, it's not what the objects are, it's what they represent.