In the last 3 seasons Ozil has directly scored or contributed to 19, 26 and 28 goals. This thread is way longer than this season so forgive me for not buying what you're saying.
That is not what he promised. He had his best years until he was 23.
Season - Club - league - minutes - goals - assists - minutes per goal/assist
2018/2019 Arsenal EPL - 1742 - 5 - 2 - 248,9
2017/2018 Arsenal EPL - 2164 - 4 - 8 - 180,3
2016/2017 Arsenal EPL - 2848 - 8 - 9 - 167,5
2015/2016 Arsenal EPL - 3049 - 6 - 19 - 122,0
2014/2015 Arsenal EPL - 1860 - 4 - 5 - 206,7
2013/2014 Arsenal EPL - 2150 - 5 - 9 - 153,6
2013/2014 Real Madrid SLL - 134 - 0 - 0 - 0,0
2012/2013 Real Madrid SLL - 2042 - 9 - 13 - 92,8
2011/2012 Real Madrid SLL - 2591 - 4 - 17 - 123,4
2010/2011 Real Madrid SLL - 2571 - 6 - 17 - 111,8
2009/2010 Werder Bremen GB - 2601 - 9 - 13 - 118,2