While Gnar was buffed in the next patch, if you check the patch notes the changes were largely about "feel".
While the width and speed of skill shots are important power points, and certainly are buffs, the intention was not to add power, the intention was to make him feel better to play. I am happy that they made these changes and later balanced him around them.
For information
Recommended items have been updated.
Stats;
Base health regen increased to 5 per 5 seconds from 3.
Rage Gene;
Fixed a bug where Gnar wouldn't gain bonus health immediately upon transformation.
Boomerang Throw:
Outgoing missile width increased to 60 from 45.
Return missile width increased to 75 from 70.
Minimum missile speed increased to 1400 from 1000.
Boomerang's return logic has been improved to better track Gnar.
Boomerang's return particles have been improved.
Boulder Toss:
Missile speed increased to 2100 from 2000.
Missile width increased to 90 from 80.
The delay before picking up boulders off the ground reduced to 0.3 seconds from 0.5 seconds.
Now checks to for enemy champions that are very close to Gnar's center point when he casts (and now hits them).
Now deals area of effect damage in a small radius on landing if it hits no enemies.
Wallop:
Fixed a bug where enemies could sometimes cast spells when Wallop's stun was overlapped with GNAR!'s stun.
GNAR!:
Now has a 50% AP scaling.
Casting time reduced to 0.4 seconds from 0.5 seconds.
Fixed a bug where GNAR!'s knockback ministun (not the wall stun) would sometimes be removed too early.
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