The question I have to ask myself about this one is "Do I think Bannon tells the truth?" The answer is that I don't. What his motive may have been in trying to give an impression of close links with a politician in a country not his own I cannot know, but clearly he must have had some reason for it. And it won't have been for the benefit of anyone but Bannon, is my guess; also it may have been nothing to do with reality, since he is clearly delusional.
To put it another way, my enemy's enemy may not be my friend, and taking as reliable someone I know to be unreliable is probably a mistake. Just because something he says appears to fit something I may have suspected, that really doesn't make it fact.
Has anyone seen all these many texts, for instance? If not, who is telling the truth about them? What was the context? Can a link be actually demonstrated? and so on.
Also, there are quite a few people I don't think I know particularly who would say they know me quite well... Usually they have no idea about me, and are a damn nuisance.
(No, I don't favour Johnson. I just don't see that an unsupported claim against him is something I am going to get excited about. And this all belongs in a Brexit thread anyway, not here. Sorry.)