agree with "up to 10 years" is just what the maximum sentence is for these crimes without any context

1. making a forged document
2. using a forged document

Considering what was actually done in context it would be absolutely insane for them to be given anything like that sentence but we would need to wait to hear the actual sentencing before all getting twisted up about how unfair it is.

Right now this is just a report saying that two crimes "making a forged document" and "using a forged document" can result in up to 10 years in jail which in itself isn't exactly shocking.

Crown prosecutor Richard Smith told jurors the trial wasn’t about debating climate change or Penwarden’s character, but the use of a falsified document. “It was just to cause disruption to the conference with a thinly veiled defence of satire woven into it,” Smith said.

I mean, makes sense. But considering her attempts to cancel the meeting didn't even work, I'd be surprised if she gets the 10 year sentence for this.