You ommitted this line from the same Athletic article:
"After selling Anthony Gordon, Tonali and Guimaraes, Newcastle would not countenance losing another key player, given rising fan sentiment, nor did they need to financially. Had United tried earlier, things may have been different, but at that stage they were still manoeuvring through midfielders."
Source
So, this very much could have and should have been done earlier in the window. Why did we wait until 3 weeks before the deadline to contact Newcastle again? Complete negligence.