Ok so it looks like the wheel setup on page 70 you're talking about is running the 19" 2017 Mazda6 OEM wheels with 265/50/19 tires. I did a quick Google search and it looks like those OEM wheels are 19x7.5 with a 45mm offset.
Keep in mind that his car is a 2016.5 and yours is a 2017 - the 2017 is a 2nd gen, while the 2016.5 is a 1st gen. That said, what you can do is figure out what your OEM wheel and tire specs are, then plug them in to a wheel size calculator. I personally use
willtheyfit.com. Input the current wheel specs you have, then input the wheel specs you're thinking of swapping to. It will tell you how the planned setup differs from the existing setup. For example:
Using this info, you can visualize how flush the new wheels will be compared to the existing wheels. In addition, you can take a photo of your existing inner rim to suspension clearance to see if you'll have any issues there as well (example shown below).
I.e. the above is my summer wheel setup on my CX-9, which has 10.5 wide wheels with a +30 offset. If I wanted to go to a 14.5" wide wheel with the same offset, it would not clear the suspension because the inner rim would be 2" closer to the suspension.