i dont believe it.
his system has never ran under 4 before, and it highly unlikely that he, or anyone in history, has pulled of a sub-420 on the same day after their first sub-4.
maybe salazar made him do another 430 or so, but theres no way he did those intervals or broke 420 again after his first sub-4. all of this is only further anaerobic preparation that salazar is having him do to re-break his collegiate 10k record.
mostly likely, he went home and took an ice bath in his underwater treadmill after his first sub 4. salazar wouldnt dare overload his system this early in the season. not atleast until late may or so.