I had heard this claim as well. I remember being stated roughly as "If 10% of cars were automated, improvements would be seen." so I decided to do some Google-Fu, I came up with a few articles quoting the linked study on that figure.
In all seriousness, If I'm a civil servant (Note not an politically appointed one, just a white collar worker) and the Speaker of the House starts grandstanding about people going to jail, I'm certainly not offering my neck out. If I'm in her position I tell them to go pound sand too. She literally has nothing to gain by testifying even presuming she is innocent and honest people can get tripped up in testimony very easy. If they wanted her testimony that bad they could have easily had it by giving her immunity.
Brings to mind the the quote "If you give me six lines written by the hand of the most honest of men, I will find something in them which will hang him."
My biggest complaint would be (if I lived in Chicago) how this tax is structured. It is a "use tax" which mean I have to keep track of everything that falls under this tax and remember to put it down on the appropriate tax form at tax time. It is a mess. It will have the same problem every other use tax does in that it will have a recordkeeping burden and that will drive non-compliance more than anything.
If they are smart they'll have a tax table where you can make a good faith estimate of your expenditures under the tax and just pay that. Several states did this with use tax due on purchases and I believe compliance went up. Otherwise this law is going to be a huge audit liability for individuals and businesses.
Those who claim the dead never return to life haven't ever been around here at quitting time.