I'm sure you are correct in your views. I really didn't know as much as you do about the OP or others. Of course, there are many more than 7 trades in the market for that period of time. The rough limit would be 6 to 7 times the range shown and the value is a market determined value not a trader skill level determined value. Mostly people doing this would not be experts but would fit into some other professional category, instead. I do not know what the pro categories are.
I was going to imply something like this, but: 10,000 hours in front of the screen, price/volume analysis, and some automation may get you there. It's that simple.
For intraday trading I use price only; on daily charts I find the 50-day SMA to be of some small value. It seems to be a price magnet. To quote Vinnie in Goodfellas after they whacked Tommie, "And dat's dat."
Good point but it rare to find a trader even willing to put in 1000 hours (6 months of real-time data) with an individual concept before they are itching to trade and thinking they are a "Trading God".
==================== Like what Don Bright {Trading Co} says about them ; ''dont put to much faith in them'' No idea if it helps his daytrading??; but much price data[hand recorded] helps in some markets. Volume-depends on the market; one[1] real estate sale may or may not mean much................................