When the guy said "millionaires do not..." I think it was pretty clear he was not actually making a universal, unequivocal statement. Yes, some do. Many do, in fact--there are a lot of millionaires on this planet. But the typical millionaire, according to surveys, does not. The typical millionaire is self-made and worth between 1 and 2 million and is at least 50 years old. Those assets will typically be used to sustain a comfortable life in early retirement. Someone who makes 10 million at age 30 is not typical at all, even though there are, numerically, a lot of such people. There are simply far more millionaires who had good careers, spent wisely, lived somewhat frugally (at least relative to their salaries), saved up, invested, and now enjoy their retirement.

And yes, of course, you can spend your money however you want. That includes spending so much of it that you aren't even a millionaire, even if you easily could be.