What it says is the same thing that Bernie's YUUUUGE rallies say; nothing of consequence.

This is the 21st century...digital media, social media, an abundance of technology to connect and network with people across vast distances, alleviating the need to be physically present to build support.

Bernie fans harping about "signs" and "rallies" is the equivalent of 19th-century textile workers championing their traditional ways while decrying the Industrial Revolution.