I'd mostly chalk it up to being about anecdotes that aren't necessarily agreed on - e.g. "Joseph-Ignace Guillotin was executed with the guillotine", which is categorically false but a thing that stuck. I can't think of any other examples of that off the top of my head, but given that that famous example is specifically about the guillotine and we're talking about the guy who has a guillotine as an NP, well.
But yes, it's probably also that it's specifically about stuff that's part of their legend and thus doesn't include nonlegendary dudes like EMIYA.