Not sure how OP was calculating the splits, but:
Jornet hit the Alpine Loop Byway after 11:45 of running.
Walmsley hit it at 7:24PM, and started at 5:57 AM, so that's 13:27. He's more than 90 minutes behind.
I compared Jornet's Strava activity, not his splits from that website.
do NOT use Kilian's strava for anything other than strava segments (later) or to help follow the route. GPS for a watch in ultra-track mode is not reliable on trails.