Yes, it's hugely disappointing. I am involved in a twar "over there" concerning the issue of whether a so-called vodka 'martini' should be allowed to be called a martini at all, and this would have been an authoritative source.

I do not accept anything without gin as its main ingredient as a martini. It's one of my favorite things to argue. So low-stakes.

Here the full PDF and it explicitly states that Vodka " It is never employed in a dry martini." salutethepig.com/wp-content/u...

here you go: Only the following three ingredients: * Gin * Dry Vermouth * Olives

I was being snarky - the original 1966 (or maybe 64?) link does work try further down the blog post