This is a deficient comparison as it completely ignores visual quality. While subjective quality takes effort to measure, they should've at least had objective

This is a deficient comparison as it completely ignores visual quality. While subjective quality takes effort to measure, they should've at least had objective metrics like SSIM or PSNR. Instead, all it is is 'We ran compression X with default settings vs compression Y with default settings and Y produced smaller files'.