Are these signs of Autism?

My baby is 18 months old he was approved for OT and speech therapy because he is 6 months delayed my son does not speak at all well except for mama and dada although he does not know the meaning behind it he says it more out of habit he does not know how to play with toys the way they should be he would rather bang on it or spin the wheels over and over no matter how many times I try to show him he just seems so uninterested he doesn't hug kiss point or wave bye bye or follow any direction he does not emulate either he does not ask for anything with gestures he does not stay still he runs back and forth in my hallway banging into the walls and doors he would rather slam doors and cabinets then play with actual toys I can carry him for a little while but the he pushes me away because he would rather be on the floor doing his own thing he's a bit of a daredevil anything that consist of us pretending to drop him he loves I had to shut off my radiator because he insist on touching it regardless how many times he gets burned he whines a bit but then hes back at it he does make eye contact with us here and there but if we stand in front of him hes moving his head to look past us he pretends he doesn't hear us I can call him 30 times in a row and it's only when he wants to look up he will he shakes his face hands and feet while stiffening his legs when excited he always has to put his bottle in the same spot when done he doesn't pay other kids attn he would rather play alone