Of course not, that's not something I would ever claim.
But, given a choice between serverside code that you absolutely can't inspect no matter what, and a binary blob that you can read with a bit of extra work, wouldn't you prefer the binary blob?
Where serverside logic is concerned, it doesn't even matter if the underlying code is Open Source. I still can't inspect the instance and tell if it's running the correct code, or what its parameters are.