Well, in essence he was. If you're a teacher, but don't want to be a member of the union, you no longer have to pay over a thousand bucks a year to be a union member... And that money will easily pay for the increase in health care/pension premiums.
More importantly though, it also helps the local cities save money by being able to negotiate better. It's funny because Milwaukee is complaining that they're in a huge budget deficit and can't do anything about it because they just signed a new union agreement for the next two years. No idea why they did that (unions forced them to?), but they would've been able to avoid it if they were smarter using Walker's bill to help them out.