It only implies that Shanks (with his crew possibly, more "ifs" here) is the only relevant dude who tried and actually managed to do it. Nothing else
You think Kizaru went up there and tried to stop Loki, but failed, and that simply isn't being mentioned to us? After all, Loki has a bounty, doesn't he?
Well, Oda isn't denying that this happened, so it might be 100% true
You're way too desperate, digging your own grave again