From the link:

"Read before following this tutorial This tutorial was written shortly after Vulkan was initially released, back in 2016. A lot has changed since then and this tutorial no longer reflects the best way to use Vulkan today.

Instead of reading this website, [they] recommend to follow the guide or one of the tutorials linked here: https://vulkan.org/learn"

If you are trying to learn Vulkan, because you are building a game/app, I recommend to have a look at V-EZ [1]. It hasn't been updated in 8 years, but serves as an interesting showcase of how to create a higher level abstraction layer on top of Vulkan. It has helped me a lot when building my own game engine.

Of course, there is also a well maintained high level library by Nvidia, NVRHI [2], that might be a better fit if you are looking for an off the shelf library for Vulkan (or DirectX).

[1]: https://github.com/GPUOpen-LibrariesAndSDKs/V-EZ [2]: https://github.com/NVIDIA-RTX/NVRHI