I'm beginning to agree that they are for Northern in view of the latest info from GWR sources although the first story was that they were for Scotrail. However, the move is not expected to take place until Monday at the earliest so that looks like their showing will be at the last minute in RTT. The 153 move is now said on WNXX to be for Heaton dropping 2 off at Leeds and the other continuing on. The fact that Heaton has been mentioned now convinces me that they ARE for Northern after and that EMT was "fake news".
You're misreading the gen on there. It's a thread I've been following closely. The first Angel 5 are for Northern and always have been. ScotRail have a finger in the pie later either with those after Northern or the Porterbrook 5 much later - no one is sure which yet. The last Angel 4 are generally reported as arriving at EMT in July (or at least that's what they've been telling their staff and even their passengers on Twitter).
People may have inferred that Neville Hill means EMT but no one who knows anything about what's occurring has ever suggested that link.