Banks/Firms have all sort of resources and types, TA, Statisticians, Quants, Mathematicians, Economists, etc.
Your mom, lost the first 4 trades in a row and that proves short term doesn't work. I make money off short term, not loads sadly, still working upto that sadly.
You wished: They are nowadays called "facilitation desks", at least on the equity side. They are supposed to only warehouse larger blocks of shares that clients try to get rid of but in reality the desks take directional views, trade index arb books to disguise intraday buying and selling (long sell hence the index arb book), and a myriad of other vehicles to take on prop positions. It is very hard to differentiate between true prop positions and "managing client trades", even for their internal risk managers and compliance officers. The same game goes on at banks just under a different name.
Let him dream. He wants to become a CTA probably with a moving average, a filter and maybe a backtesting arcade.
Technical analysis is all to do with price oscillations/trends forecasting, you don't have to use any indicators, again apples and oranges, you keep referring to TA as if it was a marketing tool kit full of indicators, etc. If your trade decisions are based on price performance, then you are using TA.