It's not new at all. Jomtien immigration is an 8 hour line up every single day. Not just Mondays. That's why you pay an agent instead of being like these brainless sheep and lining up for the whole day clogging the immigration.
Parts of the story don't add up. Witnesses reported him saying that he would swim back to shore after his kayak capsized. If he could swim, how on earth did he drown? If he couldn't swim which seems to be the case then why would he say he was swimming back and not ask for help? It really doesn't make sense. Either the witnesses are lying or something out of the ordinary happened which caused him to drown e.g. cardiac event
Reflecting on this tragic accident, a thought has come to mind - why wasn't he instructed to wear a life jacket? I know safety is a personal responsibility but I was forced to wear a life jacket in a tiny rockpool waterfall in Erawan national park. I thought the same stuff would be happening at each national park where people are involved in water activities. What's the point of forcing me to wear it in the tiny rock pool when this guy died in 90 meter deep water because he wasn't told to wear one? Thailand doesn't make sense.
I am sincerely sorry for your loss. I can't even imagine what you are going through. I know this is a sensitive time, but so that I and other travellers can be aware of the dangers of that national park, are you able to provide some info on what exactly happened to him and what has resulted in his passing? Rest in peace Odhran.