You’re looking at those stats backwards.
Your links show when those players defend Murray (not when Murray defends those players). Also, you shouldn’t have to go to each individual matchup to look at these stats for Murray. You can just go to Murray’s profile to see his defensive matchup stats against opponents. You can find it here:
https://www.nba.com/stats/player/1631099/head-to-head
Here's a summary of what those stats show (limited to players who have a minimum of 10 min) and adjusted to be per 100 possessions:
View attachment 12477
He's done fairly well against Mitchell (quick wing), Edwards (quick wing), and Mathurin (quick wing), but there are other players you classify as "quick wings" that he hasn't done well against. Perhaps this suggests he has the ability to defend quick wings and it actually has more to do with a players skill level, small sample sizes, etc.
Sometimes it takes a player a bit to figure someone out defensively, how they move, their go-to moves, etc. It doesn't mean they don't have the physical tools to defend them. And then there is the chance that the guy you're defending is just on fire which skews the small sample (which was my impression of the Keegan's defense on Vassell in particular).