Not at all! They are just saying that nowadays, computers and sound output devices are so powerful, that they can effectively create arbitrary sounds in the ent

Not at all! They are just saying that nowadays, computers and sound output devices are so powerful, that they can effectively create arbitrary sounds in the entire human hearing range. This used to not be the case: Sound was synthesized using simpler methods, which could not create arbitrary sounds, but had its very own character. Colloquially called "8 bit music" is part of that.