It's more a case of that I'm not actively trying to train him outside of recognising his issues and then purposely doing nothing; plus, I have limited knowledge when it comes to actually alleviating problems as opposed to just diagnosing them. Additionally, I'm trying to prioritise my own form issues that I need to work on as you'll see in the video below:
To be honest, most of my training time and effort with Spoffle is spent moaning at him, as a friend, to train full stop, he's never really managed to get in a training routine and will often have breaks for 6 months plus, then do 10-20 sessions, then have a large break again and start losing the strength he's gained from the 10-20 sessions he's done. I don't think he'd have any problem at all obtaining a 300kg squat if he kept into a routine for 6 months and ate more than 1-2 large meals a day. Convincing him to make these changes is where most of my energy goes.
EDITED: Just as an addition, I agree with you when you say that his spinal dysfunction is his top priority. I do believe he has something physiologically wrong with his spine, though I'm not sure what it is, he may be able to clarify. I think it may be an abnormally large gap between two of his lumbar vertebrae. I'm not sure whether this is actually having a direct impact on the neutrality of his spine during such lifts.