I think you may be interpreting the word “relevant” in a different light than the person you’re replying to.
It reads to me as if you’re saying physical media is important for humanity as a whole and the preservation of knowledge, while your parent comment is saying physical media is no longer significant to individual consumers because it’s not their preferred method of consumption.
Until that eBook inevitably gets uploaded to a piracy site. The implication is that if a web crawler can find it anywhere then it's fair game, regardless of provenance.