Interesting legal theory...
But it is wrong. Here's why.
While there is a defined "Safe School Zone" in 626it is apparently something different than what a "school zone" is. If you completely read through 626.9 and go to section (e) you will find that "school zone" has been defined as something broader than that is found in PC626. I find it amusing and somewhat telling that "safe" is omitted in the 'gun free' definition.
626.9(e) As used in this section, the following definitions shall apply
(1)"School zone" means an area in, or on the grounds of, a public or private school providing instruction
in kindergarten or grades 1 to 12, inclusive, or within a distance of 1,000 feet from the grounds of the public or private school.
There are no references as to whether or not school is actually in session. 626.9 applies 24 hours a day, 7 days a week and 365 days a year.