They went on to explain: “Bran, The Three Eyed Raven, can see everything. So all these theories about the [Night King] sneaking to Kings Landing first are BS.
“If the [Night King], or any contingent of the dead army, were heading anywhere besides Winterfell, wouldn’t Bran have seen it?”
Throughout seasons seven and eight, a lot of speculation occurred in Westeros over where the necromancer would strike first.
While the public leaders – Jon Snow (Kit Harington), Daenerys Targaryen (Emilia Clarke), etc – devised plans of how to defend from a potential attack, Bran sat idly-by.