Canon Law doesn't say anything about not attending Mass at any Catholic Church of your choice.
You have to be careful when talking in absolutes on this topic. The Novus Ordo Missae is VIRTUALLY a new religion. But that word virtually is very important and can't be left out, without exaggerating. And exaggeration of a truth is a lie.
All the other heresies left home and apostatized. This one stayed home and transformed their home instead, keeping the name, buildings, and a huge % of the trappings and terminology. Furthermore, except for a few ACTUAL heretics who deny dogmas, most of the Novus Ordo milieu doesn't *directly* deny any Catholic dogmas. They give lip service to them, or they simply kill them by neglect, and/or by mixing in so much worldliness and modern ideas. So it's not the same thing at all.
When you're talking about the Crisis in the Church, you can't point to any doctrines, except to justify your choice of lifeboat (or course of action). It's a question of PRUDENCE, not DOGMA.
You can talk about what non-Catholic services Canon Law or the Faith permits us to attend under what circuмstances -- but the Crisis and anything touching on it is a whole different ball of wax. A whole different kettle of fish.
Novus Ordo Mass is not "Lutheran" simply speaking (simpliciter).
Yes, it is dangerous to the Faith, imprudent, even sinfully rash to attend if you fully understand the Crisis, Modernism, etc. and are willfully putting your Faith in danger.
But you can't just drop in "Novus Ordo Mass" in place of "Lutheran" in every prohibition against non-Catholic sects, heresies, etc. because it's different. None of those heresies is called "The Roman Catholic Church", nor can any of them show continuity going back to the Apostles. Therefore, there CAN be people of good will who just don't understand the Crisis -- nor the need to refrain 100% from the Novus Ordo.