Well, it's concerning, but really people need to slow their hot-take roll on this one, and bone up on reading skills.
1) He was with a group in public - the group included a 17 year old. There's no indication Vurdugo knew her age or invited her, or bought her drinks, and short of that, this is nothing. How many of you at age whatever insisted on carding strangers when drinking at a bar in public?
2) Group goes to hotel. Again, there's no indication that Vurdugo knew someone else was assaulting this girl. How many of you at age whatever patrolled house parties to make sure nothing untoward was happening anywhere at any time? In fact, per the article, the sexual assault stopped when others, including Vurdugo, returned.
3) Per the article there was a fight between the women. How many of you at age whatever played the hero an intervened in fights between people whom (in all likelihood) you just met earlier that day. There's no indication anyone's life was in danger, or specifics about the length and details of the assault.
So yeah, he was near some stupid (and criminal) shit that happened in 2014-2015.
If he's found to be more culpable than the article is suggesting, then yes, it's a concern.
Otherwise, I'm not really sure what the hand-wringing is about.