It's been a bit since I played the game but I just ran a test.
The whole animation ought to render you invincible.
In the .dir it basically just turns off damage detection on entering a dodge and turns it back on when you leave the dodge. It's very generous with the I-frame time.
So if you dodge when they start the swing, you should be more than fine.

Honestly, I have no idea... Maybe @CobbleSansPyro has more insight on this? I just followed the guide on the thread, but from my experience it seems to be through the entire roll animation

Just one thing i want to ask, some might call it a skill issue, but at what point does the dodge give i-frames cause i tried and still get hit and take damage.

Yoooo, it's my thread! Cool to see someone actually making it into a mod for others to use.
Trust me, those I-frames have helped me out a ton in maps. Now y'all get to use it too.
Props to the author for doing what my lazy as should have.

Now i can truly play Haydee Souls

Thank you! I think combat feels way better with this. The actual dodge animation looks a bit jank though, but it's still better than nothing

finally, useful dodge