No, it isn’t; a dogwhistle is a message that isn’t detectable by someone unaware of it. Using lizard person like that isn’t an antisemitic dog whistle because people have been using it to disparagingly refer to the wealthy/politicians/etc. irrespective of their heritage for decades at the very least. Whether the term used to be used a specific way, or even how it originated isn’t actually relevant to the question.
Basically what I’m saying is you need to calm down and figure out the difference between being woke and being a wokescold. It’s hard to strike that ballance, but the first step is realizing you haven’t done it yet.