> zedeus says the URLs reported are not even valid and don't work
I don't see him saying that.
He said
> A funny thing to note here is that the image link, which first points at nitter.it, is a /enc/ link which only gets created by Nitter if the instance admin enables base64 link encoding for media proxying. This is not enabled for nitter.net, so I know for a fact someone copied an image from another instance (presumably nitter.it), changed the domain, and sent a complaint to Njalla.
nitter.net returns images from tweets as something like "/pic/orig/media/DP5UreOXcAEz6EI.jpg"
another instance with "base64 link encoding for media proxying" returns images from tweets as "/pic/enc/bWVkaWEvRFA1VXJlT1hjQUV6NkVJLmpwZw=="
That just means whoever got the link went to another instance first, copied the path and replaced it with nitter.net
I tried this myself, I went to another nitter instance which had "base64 link encoding for media proxying", copied the link, replaced the domain with nitter.net and it loaded the image just fine.