Do I need to enable Journaling on a Mac Pro M2 SSD?
There’s basically zero downside for journaling the filesystem metadata and huge, huge upsides so even though you don’t need to do it, I recommend everyone does it as if they needed to. The only reason not to enable journaling is if you have some desire to test failure modes of a less robust filesystem. 

As to the larger question, the boot camp info you read likely is wrong (please link to the exact article or advice if we can help be precise if it is outdated or correct). 

What’s true is you can’t have APFS and boot camp. Pick either / or


HFS with journal and the possibility to use boot camp
APFS which journals always and no possibility to use boot camp that shares space with APFS


Now you can partition your drive to be part APFS and part HFS / bootcamp, so here is the boot camp FAQ for Mojave if you want to go ahead with that plan:


https://support.apple.com/en-us/HT201468