I think the current difficulty has hit profitability hard since the fork, My earning has dropped severely.
I could be mistaken but i speculate that the high difficulty could work against the miners.
Difficulty of the math problem adjusts so the solutions are found every 2 minutes on average. That's how PoW crypto works. More miners, higher difficulty. Its miners against other miners.
I'm not sure why you feel he needs a basic reminder of how crypto works. He's saying that his profits are down, and he suspects its because of the difficulty. There's nothing incorrect about his statement. I've made the same observation many times.
My question remains, with rising difficulty and more GPU miners, how will UPX equalize hash rates for android and IoT devices? I know android is much faster now. So is GPU reportedly. What exactly are we gaining here?