I talked to Mark Ellyatt a year or two after his 313m/1026ft dive and he was experiencing what he felt were permanent injuries to his lungs from that dive. He also said that Nuno Gomes and Pascal Bernabe had experienced lasting (if not chronic) problems from their dives too. Pascal was obviously injured when a light he had on his mask imploded at depth and blew out his eardrum, making for a very difficult ascent and if I remember correctly has lead to recurring problems with vertigo and vomiting during ascent. Nuno apparently becomes deaf for a period of time after such dives. Mark's problem is that his lungs are fried and may never recover.
etc etc etc. I'm sure that all of the 10 or so guys who have operated at this depth (at least the ones who haven't died yet) have experienced similar issues.
If the point is to confirm the limits of reasonable maximum depths for executable deep diving on OC then it's already been established within reason at round about 300m. Mark's experience helped us understand the RGBM model better (and nearly cost him his life in the process) and what he says, or did at the time, that he's convinced that that diving to about the 100m mark is feasible with most off the shelf tools. After that, the going deco models start to show increasing drift from the experiences of divers without modification. I think this is a valuable insight.
Other than that, however, record setting dives are just for getting your own wiki page and generating a steady stream of students who know your name and want you to train them for big $$$$. At least, this was the take home message I got from that.
I think the message in the video the OP posted was pretty clear. Garman wants to have the biggest balls.
Good luck to him. Eventually these record setting dives will end when the body count starts to accumulate. Let's hope this time we get another "get out of jail free" card and aren't here after the dive debating the ethics of it all.....
R..