You’ve noted one thing the bill does. It also does several other things that aren’t limited to kindergarten through 2nd grade.
And if that's _all_ it said you'd be exactly right. What's the rest of the text?
> Classroom instruction by school personnel or thirdparties on sexual orientation or gender identity may not occur in kindergarten through grade 3 or [...]
The common interpretation is that telling children that some like boys or girls like girls and some like boys is "instruction on sexual orientation".
[0] https://www.flsenate.gov/Session/Bill/2022/1557/BillText/er/...
So technically you can't talk about a man loving a woman or a man loving a man, practically nobody is going to enforce the first case and only the second case will be enforced.
Whenever these bills use squishy language like "age-appropriate" it's to provide an easy out for politicians at the time while causing a chilling effect over all discussion.
A school district may not encourage classroom discussion about [sexual orientation or gender identity in primary grade levels] OR [in a manner that is not age-appropriate or developmentally appropriate for students] .
So no discussion about gender identity or sexual orientation (so don't discuss about families with two mommies) at all in primary grade levels. Then, for all (other) grade levels, no such discussion that is not age-appropriate.