Here is another nugget of this Russian expert:
https://github.com/saniv/free-game-art/issues/4#issuecomment-369676388
let's be realistic, that 500x100px-ish coloured pixelated representation is not anything accurate at all. This gave you a bit of 40Hz steps with 0.1% of original sound dynamic range for 16-bit data. It's not even near for anything meaninful except broad suggestion, like "we have more energy in this band", OK
In fact I can't guarantee that we remove every old 'stub' samples we used before we bought new samples; nor that firm did not use commercial sounds. My point is that you have to have a bit more solid proof to make such accusations.