1. "Printing money doesn't always cause inflation." -- Printing money causes inflation under all cases unless money is literally destroyed at the same rate it is printed.
A loan temporarily inflates the economy until it is paid off. By replacing credit with printed money you turn the "temporary inflation" into permanent inflation.
2. "Increase your productivity faster then your income." -- Are you kidding me? I can't speak for everyone but most people in society want to be rich and well off. That means achieving income that is far greater then what is humanly productive. Even Elon Musk as hard working as he is cannot achieve his level of income off of his own productivity alone. He had to build his wealth off the shoulders of others (aka employees). By telling people to be productive for less income he's basically telling people to work harder and don't ask for a raise.
If you're not being paid an income equivalent to the amount of work you do, then the extra value generated by your work will, of course, go to your employer. This increases income disparity and decreases consumer buying power.
Here's what I advise instead: Increase your productivity but demand that your income increases at the same rate. Be paid what you're worth. It helps the economy.
3. He fails to elucidate where income comes from and thus fails to model one very important aspect of the economy: The money cycle. The economy isn't just income coming out of thin air to facilitate transactions of product and services. Money moves in a cycle, it flows from employer to employee as wages then back to the employer when the employee pays for products. The total amount of money cycling through the economy would otherwise be fixed if it wasn't for loans and money printing.