They don't pretend. They don't use it. You can't even mention MS source code on the chat, instant ban. Their code has been rewritten and improved dozens of times. It was required as the early code was often rather bad. The 64bit code is all new and being written by very few.

What do they say about **** though? ... it sticks.

The story goes that an elderly English couple were taking an evening stroll along some Spanish beach when they came across a tanned and weather-beaten old man painting his boat. They got talking and after a while introduced themselves. But when they asked what the old man’s name was the conversation turned a little cold.

“You see the fish on the market stalls in town every day?” he said. “I catch those fish. I bring them to market. I feed the people. Do they call me Alberto the Fisherman? No!”
“You see the boats on the shoreline all clean and brightly painted? I paint those boats. Do they call me Alberto the Boatman? No!”
"You see the maisonettes on the hillside with their red roofs? I make those tiles and lay them on the roofs. Do they call me Alberto the Tiler? No!”.
"You see that bridge to the village?, I built that bridge with my own sweat and my own bare hands. Do they now call me Alberto the Bridge-builder? No, they do not! - but you know, you shag one lousy sheep.”