Scott Manley said in his video that it would almost certainly increase right up to a point where it would (probably) drop to 0.

Imagine the asteroid position is going to be in a range 1 to 100. Earth will be at position 31 when passes. That’s a 1% chance.

Now I tell you that it’s actually a 10 to 90 range ( like they predict the asteroid a bit more precisely).

The chance is now 1 in 80 or 1.25% It went up!

Now I say I’ve got more info, the number is 30 to 70. The chance is 1/40, 2.5% time to panic, it’s getting worse!

Next it’s 40 to 70. That doesn’t include 31. The chance just dropped to 0.

So the increase is showing a more accurate prediction still includes hitting earth, but at some point that prediction might show that it will miss.