Anything with a pattern is by definition not noise, and the comment was that noise had signal. If you remove all noise, no signal or pattern is lost by definiti

Anything with a pattern is by definition not noise, and the comment was that noise had signal. If you remove all noise, no signal or pattern is lost by definition. However, the issue is that lossy compression removes various types of minute detail, smoothing surfaces to reduce the amount of data that has to be stored, be it noise "grain" or skin pores, according to compression settings. Storing the original noise as it was would basically make any compression impossible.