If yr aware of that then you should also be aware of crews feeding a fish to the boat just above a gaff whilst getting fed super lite tackle in his mouth. Just for the record in the past. I think that is bull.
I think all fast catches deserve questioning. 35 mins is not one of them. I think that was a combo of a good fisherman, team and a lucky run on the fish. 15kg is the breaking strain so drag would not be been more than 10 to 12kg. Not much to hold back on a beast like that. Infact the luck is the low drag. Fish would've maybe stayed on the surface without diving because prolly didn't really feel in trouble. Next step is to chase it down. Hit the drag hard as it gets close to catch up and if luck played their way which it did they'd gaff it green. That's where all the experience lays.
Even though I don't support that kind of fishing I don't really chase records or fish for marlin. I fish to eat but enjoy a fight. I will only chase a fish if I run out of line. Even then I prolly let it spool me in a fair fight as he deserves to live. He earnt it.
15 mins as first mentioned was perfectly fair to question as to how a monster 143kg bft could be caught. 35mins is possible depending on the above mentioned.