The question is, how much that dude lost before hitting that multiplier and having that base bet of $1250? No one knows but having this kind of betting does signify that this dude is a whale.
The thing is we can't know how much he has wagered and this was unsponsored win shared by the team so don't know how much he has spent while hitting that number but if you are lucky in gambling in the end that matters the most and he was among that basket with some golden eggs that returned him with $600k win which is immense and even if he has wagered more than it he got good amount back.
We are termed lucky when we win because in gambling otherwise we are at risk always of losing money so what matters is our luck and winning amount in the end.