^I don't see why you'd think it was a B5 reference. ENT established Archer as a critical figure in the formation of the Federation. It's natural enough to speculate that he might have gone on to become president of the UFP at some point, just as central founding figures such as Washington, Adams, and Jefferson became presidents of the US, or as Nehru became prime minister of India, or as Lech Walesa became president of post-communist Poland, or as Nelson Mandela became president of post-apartheid South Africa. There are so very many historical precedents that it's frankly bizarre to assume it was copying another work of fiction. If anything, both B5 and ENT were drawing on the same extensive set of historical precedents.