Oh snaaaaaaaap, I remember when Marc Laidlaw released those notes! I read all that sh1t too, since I figured we never gonna get an actual HL3/HL2 Ep3.
"Inspired by the epic cliffhanger from Half-Life 2: Episode Two, Project Borealis represents a fan-made effort to realize a cohesive story conclusion to the episodic series."
Aaawww c'mon, I don't want to go back to Ravenholm! So what, now I have to fight headcrab zombies in the snow?!
Oh wow, they made this in UE5.
Well I guess I'll give it a whirl. But any community dev team releasing a project after Black Mesa has their work cut out for them.