No... you need an FBA first. That drives the BIP.
You need an advocate. This is an insane situation. I'm surprised you are so polite still. I would be in the school's face on the daily.
It is inexcusable that the school is approaching this as a discipline issue instead of providing what this child needs to avoid the meltdowns.
Do you have a recent evaluation with suggestions from your child's developmental pediatrician? If not, call and get an appointment ASAP so you have some professional direction to share with the school. This will trigger an automatic and legally required IEP meeting bc the school has to review and consider your outside data.
Since there is only one week left of school you should do this over the summer and slap that evaluation on the school first day.
I'm outraged for you. My unsupported autistic child was sent to the principal's office once; I gave them an earful, and then got a FBA and BIP. We are now in a better placement for my child. We only got it bc I was in the school's face every single time there was an incident. These incidents occur BECAUSE the child is UNSUPPORTED. Do not let this continue!