You're probably kidding but I wouldn't put it past someone. Unscrupulous people bring antifreeze in gatorade bottles to the car auction and dump it under cars they want. Be careful out there.
By the way I had to spend at least a second trying to figure out whether that antifreeze was somehow going to offgas and damage the vehicle undercarriage :)
But it’s just straightforward dishonest fake leak. Scoundrels!