I didnt see rules pertaining of the payout to PM is 150GET. As far as i know it is only 100 GET, last time it is 50 GET only may be you see the need more 50 GET to request payout in PM, is already added to the 100 GET that recently announced.
Then I understand it must be 100 GET to request payout in PM. Actually the rule is we need more 50 GETs to request payout in PM, so if before it was just 50 GET points, now it will be 100.