If you read it said
This means that a Masu = 500 ml. Fill up a Masu twice, you get 1,000 ml which is 1 liter or 1 kilogram
So where did the 50 Masu of water is equal to 50 kg come from? They were explaining 500 ml water can fit into a masu before.
Edit: I get why I'm confused now
if a 500 ml...