Hi folks and peeps and stuff.
I clicked on my saved #Terracore link just now and, got the above.
Between playing this morning and now, I'm not sure how the url was changed, but possibly worth folks knowing about if someone is playing silly beggars with the game, as opposed to just me locally.
They've moved to use this officially: https://www.terracoregame.com/
Thanks @acidyo I found that. just wasn't sure if it was something I'd done, or not.