[SRW]

It's also not a "change" of the rules.

6.13 Eight-Run Rule
A regulation eight-run-rule game shall be declared by the plate umpire if
one team is ahead by eight or more runs after five or more equal innings.
Complete innings must be played unless the home team reaches the eightrun
lead while at bat. Any hit that results in an eight-run lead by the home
team (after 4-1/2 innings) is treated as a game-ending hit. (See Rule 14.6.)
Whenever the visiting team reaches the limit in the fifth or sixth inning,
the home team must have its opportunity to bat in the bottom half of the
inning.

Note: The eight-run rule may not be set aside by competing teams, league,
conference or tournament rule.

Exception: For NCAA tournament play only, the respective NCAA
divisional softball committees may elect to remove the eight-run rule for
the championship game, provided it is formally declared before the start of
the tournament.

Italics added by me.