There is nothing new about Russia interfering with foreign elections. What is new is that a presidential candidate can be accused of colluding with Russia. You can't just go back to say "Russian collusion" means something else, when in fact the mainstream media and the Democrat Party members at the time was claiming Trump colluded with Putin.
Clearly a joke at the expense of the ineptitude of his opponent's campaign. The fact people point to this as their "evidence" is pretty clearly desperation and self-delusion.
Right, because it's not like he's lied about this specific event in campaign speeches[0], or specifically asked a foreign power to assist in digging up dirt on an opponent on live TV more than once[1] or anything...