Can shortpixel Image Optimization plugin for WordPress help with "serve scaled images" issue?
The ShortPixel Image Optimizer plugin only optimizes the images, replacing them with their compressed versions. It does not scale them.
But we do have another plugin called ShortPixel Adaptive Images and this serves appropriately sized, optimized images from our global CDN.
Here is the "How to get started with ShortPixel Adaptive Images" guide.