I don't think they meant it in a disparaging way, except maybe against Apple. Moreso that typically filesystems that can support deduplication include a deduplication tool in it's standard suite of FS tools. I too find it odd that Apple does not do this.

By now, you know it’s not de-duping anything-nothing is deleted.

Of course the Copy-on-Write clone functionality has been available since APFS became the default file system in 2019.

I didnt mean that the work was trivial, but the tool seems like something that could be a simple CLI