Depends, sort of. The code shows some creativity and shows you know how to work with templates. Sure, it's 2020, but I'm pretty sure there's quite a lot of people who have used C++ but cannot come up with the code you see in the final version. Which shouldn't be a problem I guess, but only as long as you're just an API consumer and don't have to produce one.
Why? This piece shows that the author seems to be resourceful, creative and has a reasonably good understanding of C++. Would a change like this land in production? That's probably what code reviews are for.
If we want to improve the hiring process, we should start applying a higher order degree of thinking when vetting candidates.
It would be enough to get an interview for me. :) They would have to tell me when they felt it was appropriate and inappropriate to use such a trick to get a hire. It feels like most C++ devs don't know SFINAE - I'd rather find someone who knows deeper bits of the language and encourage them to use their talents appropriately.