From a game designer's standpoint:
You can do your coding and rendering at the same time. You can overwrite your image and animation files when they are done rendering and replace the dummy files you used when coding and testing. This is how it should be done. Not doing it this way is really strange if a person really cares about releasing their game's updates.(basically everything is coded and tested, all variables are what they should be and text, scene changes, animation sequences in place before just simply replace dummy no content animation and image files with your renders and have much less to test because you only need to test that the scenes and animations work and were placed properly)
He has not tested his code yet. It may time time to work out the bugs. I will say coding for a day's gameplay should only take an hour or less if you have the story planned out already and know what you want the characters to say. If he doesn't know then that's really sus considering all the time he had to think about that. I think this update will be three days?.. but I don't remember. Regardless, if you dedicate a day to sit down, code, and bug test for just three in game days - it should only take one day. It is the renders and art that takes time.
This is just ridiculous and I don't think his head is in the game so to speak