> I have never read something describing me that perfectly, however I'm unsure if the post is not just too generic.
It is quite generic. Anyone who ever did something outside of the clearly defined scope of their role can be feel as a wildcard to some extend.
But I'd say there is some difference between „I'm a software dev but I also do a bit of server admin and occasionally customer support“ or „I'm a software dev, but I also do server admin and occasionally customer support, email campaigns, blog posts, modelling and sales“.
I do consider myself somewhat a "wildcard" dude since I do fit all the points listed in the article, or when I compared myself to friends of mine, where they want roles, categories... But again, I do not want to self-categorise and I would also add that IT helps it.