It's not the career earnings but the current win of credits! That 1300 cr payout (congrats, but don't be fooled to count it as $!) means a tremendous push to your tier rating.
I don't know the details, but your promotion average of 65.10 shows that it's not the same procedure as with the match play wins.
/methinks that all counts have been reset now - you need a lot of good scores or match wins or credit wins to be promoted to Legend.
Have fun!