I'm one that had seizures due to Lyme and other associated infections, and what you describe at first does sound like the absence seizures I had, and I also had other types of seizures also. I don't know if they would have been considered "true" seizures, as I was never evaluated - I couldn't find a doctor that would see me.
I agree with Quin, though. Unless your son has other symptoms/blood tests that show Lyme or other tick-borne infections, or you've seen a bulls-eye rash(like one of these:
https://www.bayarealyme.org/blog/lyme-disease-bullseye-rash/), or other evidence of a chronic infection, that wouldn't be my first guess at what he may be dealing with either.
Best of luck with your investigations!! I hope you find answers soon! I know how scary this all is!