While the red/green highlighting works great side-by-side, like in the body of a suggested edit, it's difficult to read in title changes because there is no before and after to compare.
While this isn't the worst I've seen, it's still difficult to see how much better the new title is compared to the old. In body changes, the side-by-side display makes this easy.
I suggest separating the current and suggested titles. Here are a few ideas in order of preference:
#1 - Side-by-side just like the body
#2 - Stacked
#3 - Stacked, alternate color scheme (entire title red or green, no need for caption)
Not related, but similar title (I did look): https://meta.stackexchange.com/q/78046/172756