EDIT: yeah, the domain expired and got snapped up:
Still available for purchase at Amazon, though:
https://www.amazon.com/s?k=omni+magazine
=-=-=-=
TFA is just rambling on about the origins of the magazine, but the archive is supposed to be here:
https://omni.media/channel/omni-archive
But on my end it appears that the domain is down.
The Internet Archive has a copy: https://archive.org/details/omni-archive/.