I must admit, it's surprising. DD1 goes to special school now, but the preschool waited 8 weeks to tell me their concerns (the 6 weeks before the summer holidays, when she started, and two weeks after the summer holidays). They deliberately waited to see if she would mature over the summer holidays, but she didn't.
I'd ask them to contact the local inclusion co-ordinator as a first step, if they feel they need support. Meanwhile, any evidence they compile for him/her can be copied to you, so that you can take that to the GP and ask for referral to the Paediatrician.
For example, when DD1 left school, I was given her file and it had an 'activity map' which was completed after 4 weeks at preschool. It was simply a diagram of the floor layout of the preschool, with lines charting DD's movements over the course of about 30 minutes, with a time by each line. The chart was like a firework display
Several of the lines related to the same one minute interval, because she was literally bombing around the setting, picking up a paint brush and dropping it again, etc.
I remember they had painting set up ready for the morning session, and as she walked past the easel, she picked up a paintbrush, dabbed it into the paint, painted a stripe on the paper and dropped the brush as she made her way to the carpet!