There are a bunch of Half-Life ports and remakes, so to save you all the time, it’s a Black Mesa demake (back to GoldSrc).

Yo dawg, I heard you like remakes

Hah, I just played through Black Mesa recently and was thinking it could use a remake since it’s starting to show it’s age a bit. I’d love to see it done using Source 2

Edit: after actually reading the article, apparently this is like a reverse remake which is still pretty neat