Yeah thats just completely false. The second amendment does not say arms are a right of the militia.

“A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.”

“the right of the people”. This was not an accident. The founding father’s rejected different drafts that made arms a right of the militia, instead realizing the government would use that wording to restrict people’s rights with the argument they aren’t part of a malitia.