This is an OPEN CARRY forum
So that law you cite would not require concealed carry.
If they tried to restrict carry to concealed only, then it would violate that law you posted.
Weapons prohibited in certain places — Local laws and ordinances — Exceptions — Penalty.
(2) Cities, towns, counties, and other municipalities may enact laws and ordinances:
(b) Restricting the possession of firearms in any stadium or convention center, operated by a city, town, county, or other municipality, except that such restrictions shall not apply to:
(i) Any pistol in the possession of a person licensed under RCW 9.41.070 or exempt from the licensing requirement by RCW 9.41.060; or