Their original target were lower, they raised it. Still not much of help, but still it is better. As for the 4 degree increase. I have not heard anything about a 4 degree increase. In COP26, several members said that 1.5 degree dream was alive, barely.

Realistcally speaking, 1.5 degrees would not be possible, it would be 2 or even 2.5 degrees, however, I dont think it would be such a drastic increase (4 degrees).