a few points:
Instead of removing it from aminet it should have been replaced with a file pointing to the new location - and done after it was available for download.
Even better - the one on aminet should have been kept but a note added pointing to your site - what if your site goes down ? What happens in the future when this website disappears suddenly because you have lost interest or some other reason (I have seen many Amiga websites come and go) - the Aminet system was decent - it would have made sense to continue using it.
Right now the download link gives a WSOD.. Not DNS related.