Yes, that is correct. Wowza only support ShoutCast audio re-streaming, which is an http source, but Wowza does not support ingress of cupertino or other HTTP streams. You can use
VLC in between. Take a look at the transcoding examples at the bottom of that article. If VLC can play your stream, you should be able to transcode and send it to Wowza with VLC, then follow the mpeg-ts article to re-stream from VLC.