Well 1400m 3700ft on a hot summer day... That sounds pretty tight even for such a great aircraft.
Can you be bothered to read the thread before posting ? 4500ft of rwy is plenty for C680/C680A. At 35°C she'd use, at MLM, an unfactored LDR 2740ft. 2350 at a reasonable LDM of 22000lbs.
BOM about 19000 plus 1000 payload (2,5 person is way less, just lets pretend they have a lof luggage = 20000lbs. Mindiv fuel roughly 1500lbs, that would put the AC at about 21500-22000.
2350*1,67 -> 3925ft. And LDA apprently had nothing to do with the accident.