Not quite. You need to deduct 180 as that was the season ticket points for renewing for last season, then divide by 2 and add 190 (loyalty points for renewing this season).
Think you're right, looked to quickly at the clubs explanation. So am I right in assuming you deduct 180 pts which you would have had at the start in respect of your season ticket and add 190 for renewing for the 7th time?
As I understand it, you have last seasons total, take off 200 (assuming you have had a season since day one of the Amex), halve the remainder then, assuming you have renewed your season, add in 200 again.