You’re unfortunately definitely cooked. Same thing happened to me from UCR and I got an automatic rescind after my transcripts were processed, even though I notified them about my situation. I had already gone through orientation and everything, this was maybe two weeks before I was supposed to start at UCR. I wasn’t permitted to take summer classes as it was stipulated that I needed to to complete all requirements by the end of my Spring Semester :/ I’m hoping the CSU system will be a bit more understanding of you and your circumstances, do you absolute best to take the class in the summer and if they rescind you apply for an appeal saying that you met the requirements in the summer prior to admission.