Michael Moore on how Harris-Walz can defeat Trump: ‘Do weird and cringe until the debate, then nail him’

I don't think it is anything specific, just support for the current approach the Harris/Walz campaign tactics and then to take it more seriously at the debate. Which is probably the plan already.

My guess: Harris/Walz should continue to play up the weird and cringe because it's effective. This frames everything Trump will say during the debate as weird and he will constantly be fighting not to be weird the entire time. He probably will say many weird things due to this (and let's face it, he does say some weird shit anyway), so Harris can "nail" him by simply calling it out and asking for details on any weird response. This will cause things to not only get heated but act as a multiplier on the weird content since it's common for Trump to double down. 🍿🍿🍿

I too was wondering about that line.
At first I thought he was suggesting Harris/Walz should be weird and cringy. I only just realized he's suggesting that they keep referring to Trump/Vance as being weird and cringy - to keep pointing out the those two are not normal.

That line would have been clearer if written...

...do 'weird' and "cringe" until the debate...

I’m going to guess that Michael Moore is a little kooky.