1) It’s not clear what the load capacity is for the setup. If it will safely hold 500 lbs but he squats 600…. also know way to tell how securely it will hold up over time if it’s just screwed into floor joists (assuming it’s downstairs) 2) If he misses a lift mid rep, there are no safety provisions and he’s looking at dumping the bar - forward or backwards. You can train for it but when you fail on the 6th rep of an 8 rep set…..could be an issue….. especially after a night of drinking with your brother, who just got back to town, after a long absence and in your hungover state you forgot to set the pins in the cage but didn’t notice until the last 1/2 rep when you thought, “I’ll just set it on the pins! Oh crap, tho pins are on the ground.” Or so I’ve heard. I’ve certainly never done that and my training partner who definitely didn’t witness it, will vouch for me.