As far as I understand from the thread you mentioned, it's not an ideal way to do it. ( Or have I missed the point)
I'm having a super weird problem. If the make my chest into an area2d node the player stops colliding with it. The bullet works but so do all the objects that have a collision box.
If the keep it an area staticbody2d node I don't know how to have it interact with the bullet.
How can I specify just this
If the bullet collides with object -> object shakes