It’s because they’re magnetic?

Seriously? "It's because of MAGNETS!". ?

Graphene and its oxide have very weak diamagnetic properties. With some special and still mostly theoretical treatment and conditions you could make it behave like ferromagnetic. But still very weak and useless.

Though there’s proof of graphene so that’s why i think people speculate about it

No. It is very simple:

TPTB use fear to control masses. Sheeple easily eat that coronahoax fear. But there are some people who didn't bought it. They need some fear too. So, here it is. For you, by special order. If you don't scared by virus, you will be happily scare yourself with that useless graphene. Just like that sheeple scared by their useless virus. The goal is reached. TPTB put a check mark on line with "Scare all that dumb people to death" text and pass to next line.

Fuck, graphene is really USELESS. In 30 years nobody found a single real use for that shit, in spite of thousands nifty pictures and fantasy articles. The best potential (still potential) use of graphene is just electrodes in supercapacitors. And that is all.