There's no way this is true. You simply aren't accurately remembering the actual experience of using that laptop 15 years ago. For starters, the laptop 15 years ago was using a spinning rust hard disk, so everything was much slower compared to today's lightning fast SSD. I remember when it used to take minutes to boot up a laptop and launch a few applications, and it took almost that long to resume from hibernation. Modern laptops are much, much faster.
I think they are in agreement and retorting the gp who said we are at peak computing. Clearly we aren't if their programs are not launched instantly. Clearly there is room for improvement.