He'll pull it off, get feature complete, and spend a year or two with better models as they are released ironing it out. We just did an experiment, in four weeks generated 3500 commits, 200k sloc with a 1:1.15 ratio of production to test code and it all works very well. We are well on our way from 10x to 100x.
Did you check with the end user as to how well its actually working? My prior company is doing this and their platform has gone to latency/bug hell.
loading story #50307258
and if you enable dangerously_skip_permissions you can probably even get to 1000x