There's no semantics in there. It's pretty clear. If you don't agree with the law, and choose not to enforce it because of that, it's not officer discretion.
If you say so.....lol
When I pull over an adult without a seatbelt on, I inform them of the violation, then move on to whatever I stopped them for. Same way it is for many things. Same it would be if I was unlucky enough to work somewhere with a mask law.
Same way it plays out 1000s of time a day in the US. That absolutely is discretion.