I'm pretty sure that was a joke, flicker is obviously not desirable. I've found that trailing-edge dimmers work well to dim a lot of otherwise finicky LED bulbs.
Yes if you dim an incandescent lamp it can last many, many thousands of hours. As has been discussed before though, you pay for that extended life in energy costs. When an incandescent lamp is dimmed down to maybe 5% of full lumens it will still consume something like 50% of rated power. With LED the opposite is true, dim it down and it produces more lumens per watt.