It doesn't indicate any shift, truly. The two party primary vote was still 62-38 in favor of the GOP in Kansas. Just further proof that ballot measures like this and minimum wage increases can decisively pass while voters send Republicans to higher office.
That fact alone is good for the GOP but putting it in greater historically and circumstantial context it doesn't look so great.
The GOP always has a massive primary turnout edge in KS, often over 25 points in their favor. Also consider that on the Dem side there weren't any significant competitive primary elections.
Another factor too is all these Independents who overwhelmingly voted no, and showed up just to do so given they can't vote in D or R primaries. How do they lean and who will they vote for come 2022?