I think you are mistaken, this just an old iron hay cutter. I have exactly the same thing in my backyard.
https://somersetshop.co.uk/old-vintage-cast-iron-chaff-cutte...
https://somersetshop.co.uk/old-vintage-cast-iron-chaff-cutte...
I did find another, very different, device in this French news article which is a peat press in a Paris museum exhibit about Kerguelen, which was mistakenly called a "penguin press". It was actually used to make peat bricks, either as building material or as fuel.
So is there some myth that means that any press-like device on Kerguelen is assumed to have been used on penguins?
https://la1ere.francetvinfo.fr/2015/04/06/la-decouverte-des-...
It was "common knowledge" but I'm not that surprised either to hear that it's wrong.