That must be quite the line, considering that there's been innumerable people choked out in Judo and Bjj both in randori and competition for the better part of a century. I've yet to hear of a single case where someone has died or experienced brain damage from getting choked out while performing Bjj or Judo chokes.
Heres 2 from a RNC
Man killed friend with rear naked choke hold - News - The Times-Tribune
Man 24 killed by his cousin 14 from a chokehold they did while watching Wrestlemania Daily Mail Online
Surely you remember the Eric Garner drama, RNC was used there
folks trying to re-enact or use chokes and having severe repurcussoins isnt a rarity.
You're either playing ignorant, or ignoring it to make grappling sound safer