Politicians love to kick the can down the road. Let's say the Dem's plan was to get the Biden vote delayed by 10 days. Then delayed again. This pushes the vote out beyond inauguration day, but also allows Pelosi to use continuity of government protocols to remove Trump and Pence and become acting President. In this scenario, Trump has no wriggle room because the steal has not actually happened. It's a safe move which let's Pelosi take control without shots being fired so to speak.
The Dems planned to create a disturbance using Antifa, so it looks bad for Trump. But, Trump is on top of this. Antifa with embedded spec ops are let into the Capitol building. Not supposed to happen. Dems evacuated, hardware stolen. This assumes Pelosi and others are using personal devices which don't connect to the internet.
Pence, meanwhile is running the vote. With the Antifa invasion, tempers run hot. Reps roll over. The opportunity suddenly presents itself to steal the election there and then. In warfare, this is similar to a front collapsing, offering the enemy the chance to storm forward. The Dems go for it. They get the nom for Biden. However, this was NOT their plan. It was Trump's plan.
He baited them, they fell for it. Now he has two weeks to move. This is why Pelosi is so mad. It's why Trump has to be removed ASAP. For the next two weeks they are as exposed as hell.
This does of course assume that Pence is a white hat after all…