He's not mentioned dialysis again since that one time he said it was to address "dehydration", right? I think he fucked up big time letting that slip. Lucas is as narcissistic as he is ignorant and stupid, so he either thought dialysis was a rehydration procedure or thought it was far too technical and clever a word for lesser people to understand and just lied, but either way I doubt he would say he needed dialysis if he didn't need dialysis, because if he was going to make it up for attention he would have at least checked what it meant and realised it would reveal what bad shape he was in as a result of his own decisions.
You don't do dialysis as a one-off except in some very rare poisoning cases and things like that. You do dialysis because your kidneys are fucked, and a kidney that is badly enough fucked to need dialysis is long past the point at which it can be un-fucked. At that point you get a transplant or you do dialysis on the regular until you expire. And if said kidney failure is a diabetes complication, said expiry isn't far away. We're talking months. And there's no way in hell an obese non-compliant diabetic with Lucas' lifestyle is getting a fucking transplant. Lucas is dying.
As for the lack of content, I think firstly it's that dialysis is fucking exhausting. You will feel like shit for a few hours afterwards because all your blood has been drained from your body, rumbled through a machine, and then put back. That's a big shock for even a healthy body. And when you're not on dialysis you feel like shit because your blood is full of all sorts of unwanted shit that should be in your urine but isn't because your kidneys don't work. Not to mention that even regular dialysis (2-3 times a week is normal) isn't as effective as real kidneys. Lucas will be feeling tired and unwell 24/7, especially if he's outside all the time in the heat. He may not have the energy to do videos, maybe just repost stupid memes between naps.
But also I think it's finally dawned on him that he's dying. And that's enough to throw off anyone's groove, especially someone as arrogant and narcissistic as Lucas. He probably thought he was invincible, now he might not even see Christmas. It'll be even more of a shock to him than it would be to most people. He's probably trying to maintain some kind of denial, but I doubt he is succeeding, especially given how tired he will be, how unwell he is, and the sheer amount of time he needs to spend in the hospital.
I'm with those posters who think we'll see one last fireworks show as it dawns on him that he will die having achieved nothing, either from an objective perspective or from his own perspective of his Zoomer Bae or whatever the fuck. He'll move from denial to anger, and may not even have time to go through the other stages until his poisoned blood causes his other organs to shut down until he dies in horrible pain, unloved and unmourned.
Personally I can't wait.