The author of the reddit post has his points, but I STRONGLY DISAGREE with point 5. "Anything that works on the intraday time-frame is considered HFT" and "trade daily+ timeframes, it will save you some frustration" are 100% wrong.
According to INVESTOPEDIA, HFT means "uses powerful computers to...
I think you are thinking too much. I understand your concerns, but your top priority is to develop the trading strategy that works in live trading, not to think about "someone may steal my profitable strategy". I do not believe that it is that easy to steal someone's working strategy, also NO...