The product is compatible with Apple product. All features still work with Apple products except playback of iTunes DRM protected content. It is clear from the statement that Apple made a change that prevents their DRM from being decrypted in Safari. this is a change sandisk or any other manufacturer has no control over (this issue effects all products in this class and even content stored on network shares see similar posts on Western Digital forums)
If you want this to change you should contact Apple and request they reenable this feature. There is not really anything SanDisk can do about what changes Apple makes to Safari. Apple choose to disable this feature in iOS 8 and unfortunately they are the only ones that can reenable it but just because iTunes DRM content is not functional it does not mean the device is not compatible with Apple devices.
