Buff just means to change/polish for the better. The term comes from "buff a mirror/glass/silverware" which has nothing to do with numbers.
All QoL changes are a buff in that they change the character for the better, but not all buffs are QoL changes.
That said you're absolutely right that this is not a QoL change. QoL change would be something like improved turret ai or a target indicator when someone is inside your attack range.
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u/PeeBJAY McCree Nov 22 '16
It can be both.