Misbehaving 4 year old

I’m a nanny for a 4 year old and I’m 99.9% sure that he is on the spectrum but the parents have never said anything about it so I’m pretty sure they don’t see what I see.

He has been misbehaving a lot the past month and he’s been in time out almost every day from not listening and hitting and kicking.

For example, he will do something and I will tell him not to do it and he will look at me and just do it again. Like he could be banging something against the window and I’ll tell him to stop hitting whatever he has against the window and he will just look at me and act like he didn’t hear me and do it again while looking at me.

Or he could be pushing his feet against me and I’ll ask him to stop and instead of stopping he will look at me and just kick me

Or he will just flat out not listen when I tell him to do something like go potty, get dressed, eat his food, etc.

The reason I think he’s on the spectrum is completely unrelated to these things.... these behaviors sound like just regular 4 year olds behavior (I think...)

There’s no way I can bring up the fact that I think he’s on the spectrum without them getting offended and maybe even firing me... a lot of parents are blind to things that are “wrong” with their kids. (Autism isn’t something that’s wrong with a child but I think you know what I’m trying to say)

I have no idea how to hint to them that he could be..... it took from November- August in order for them to listen to me that he has asthma and to go get him diagnosed. Even though the entire month of November he pretty much had an asthma attack every day with no inhaler to help and would cough so hard he would throw up.

Also since he’s not diagnosed as being on the spectrum I obviously can’t just assume that he’s on the spectrum... but at the same time, I would like to know if anyone has any advice on how to discipline him in moments when he’s not listening or when he’s hitting and kicking because I’m assuming it’s different than just putting a different child in time out and expecting the situation to be fixed