Article title is slightly misleading: by smaller they mean process size, increasing the range of the rowhammer attacks logically due to decreased distance between memory cells even though the physics limited distance is the same.
With all due respect, but I will have to push back on your categorization as 'slightly misleading' here. Your explanation effectively explains the headline and is also what Google researchers said. How is the headline misleading?
Clearly I was wrong, but confusion can happen with just saying "smaller", many meanings are there for that word.
The changed title is much more informative.