The graveyard probably exists, it is described here: https://irishhistory.com/places/graveyard-ballinagee-co-wicklow/
On the satellite view, the cemetery boundary is clearly visible. Perhaps it’s possible to get in during a season when the ferns have withered?

You're right, 0,14 can't be the right width. I would say I mistype 1,40m, but I can't go back there to be sure. And I remember that this gate was not very large when I passed through, so 0.80 seems OK.