Rat Bikes! Pub Bikes Beaters! Frankenbikes!

Dunno, looks more like a 18-44 to me.
But then, if the rider has the ability to spin fast enough to make that gearing usable, then good for them, prolongs their knee joints!

that's still around the 65GI mark (based on a guess of those being 25c), not super spinny for casual riding it's probably perfect, although i think the cog looks closer to 16 as said above