A question for experienced players: what is this, how does it work, and should I trust it? Dx9 > Vulkan

I came across an interesting post on this forum, where a user talked about how he modified the game's .dll files, and now it runs on Vulkan instead of DirectX 9. In theory, it sounds cool; Vulkan is definitely better than DirectX 9. BUT!
How does this work with such an old game like Heroes 5? Is this a normal .dll file? Is it even worth paying attention to, or is it not worth it?
Those who understand this, please explain: is this a good file that the user shared, a situational file that not everyone needs, or is it just nonsense? ))