Yes, I think some of these competitive MMA things are illegal here in Sweden.

But when I think sports I think things like soccer, tennis, swimming, wrestling etc.

These things you bring up are very niche, and I don't understand their relevance to whether it's a good idea to use the law to make choking in pornography less visible.

I practiced BJJ for a couple years. I was much more comfortable with chokes than joint locks. There seems to be a lot of misconception around blood chokes which I attribute mostly to movies. You'll see someone grab another person in a rear naked choke and they are unconscious (or dead) for as long as is convenient for the story to continue. Blood chokes come on fast and they go away fast. I've choked two people unconscious in training accidentally. Both recovered in under five seconds and just seemed confused and didn't even realize they had been caught out.

Joints don't have that amount of forgiveness. If you over-apply a joint lock then the joint or bone or ligaments are damaged. Period. Literally no one has ever died in modern combat sports from a choke. No one. Zero. None. But there are plenty of deaths and traumatic injuries from other combat sport actions. The only way to accidentally kill someone with a choke is to hold it for multiple minutes while they are unconscious as was the case for Jordan Neely.

None of this comment has anything to do with choking in pornography.