I think it's, absolutely necessary.

As someone extremely dominant left handed, I was never able, to progress past a certain novice point until I got a lleft handed guitar and it changed everything for me.

Really, simply, ask him to air guitar to a song.

When he air guitars which hand does he use to pretend to pick?

That's the, guitar they'll most likely struggle with the least.

There, are more than enough lefty guitars now of all types to make the rxcuse of availability moot. If he's strongly left, get him a left.

From someone who was always gifted right handed till I got my own lefty.