I was trying to get back to speedrunning the game again, and watched Kyanite newest tutorial on speedrunning, and he said macro isn't allowed, and im just confused because 1 year ago or so it was completely allowed and there even is a link to downloading the space macro on the resources tab in here, just wanted to make sure I can use it

Yes the Space Macro Found in "Resources" is allowed!

This didn't aged well

Well, for all the future people reading this, the Space Macro is removed and not allowed anymore.

And in the hl1 movement too?

Yes, no exceptions for now

What about already existed speedruns?

Every run made before rule changes are unaffected

but WR in the hl1 movement cannot be beaten without it.