I'm not saying that a backend developer can't do some frontend, or that a frontend developer can't do some backend. I'm just saying that the mythical "full stack developer" that is as good as a dedicated backend developer and dedicated frontend developer put together simply doesn't exist. Any company that thinks this mythical creature exists is going to be sorely disappointed. Rather say that you're looking for a backend developer who knows some frontend, or a frontend developer who knows some backend. Otherwise you're going to land up with a jack of all trades and master of none.
It would appear that I'm a mythical creature.
However, you assume that a full stack developer is as good as a dedicated backend developer and a dedicated frontend developer put together. And that isn't the case. It's merely someone who works with the full stack.
I'm stronger at backend than frontend but I develop complete web applications. All parts of it. Some of my web apps run at banks, some at overseas governments. I also developed an app in Xamarin to accompany one of the web apps but I wouldn't call myself an app developer.
Because I'm not as good with javascript as I am with C#, I'm very happy to say that I'm currently doing a project in Blazor webassembly and it's a joy. It speeds up frontend development so much.
When looking at this job posting, I do everything that's mentioned except I haven't worked with Angular, NodeJS and Google AppScript.