Upon what do you base that claim?
Practically every video he puts out supports this claim.
He continually correlates the "better" a part is by how much he pays for it. He even lines up his "upgrade" capacitors in a linear fashion in regard to price, as he goes down the list the price increases and each time he reaches a higher price he says something like "this cap is x times more expensive but the sound has less "smear" and more "clarity". Every time!!
He not once shows a clear before and after measurement between the two parts to support his claim.
His gross incompetence as an engineer shows time and time again how little he knows, almost every time he opens his mouth either a lie comes out of misinformation, I don't know his intent so I cannot be certain which one it is. A lie is when he knows what he says isn't true but says it anyway for profit. I'm leaning towards a liar more and more I watch is videos and try to communicate with him because he is ignorant about the subject and will not broaden his understandings because it will get in the way of profit.
He continually wastes customers money on things that don't matter, if they did matter it would be easily measurable and verifiable. But he falls back on the old adage "we don't know how to measure audible quality, we can only listen and my ears tell me I'm doing the right thing". Sadly he doesn't take into consideration an entire aspect of audio, perception and bias. If in his reality he thinks things are better then they are better, he's not objective and he only cares about stuff he can sell you based on not promoting anything he can't "upgrade". If he can't make money on it he doesn't recommend it.
Someone needs to start a youtube channel debunking everything Danny says as a service to the people. Far too many have already been taken advantage of by this clown. His title as an "expert" on the matter is sad and laughable at the same time.