I assume you mean https://web.archive.org/web/20201106185230if_/https://www.fa... because you've brought this up like six times already, but I think you're overinterpreting it. To me it looks like someone pasted a headline from some news story reporting the heads-on-pikes comment. Probably some intern, as I doubt that Bannon is pasting things into Facebook, he is surely too vain for that.
That's the same verified Facebook page that hosts his weekly live stream.
You can say that those aren't his words, but... his platform again states he's calling for the President to execute two people.