Never use a vacuum on electronics! Use cans of compressed air instead. The author partially addressed this in the article but I feel that the message doesn't really come out as clear as it should. The static generated by a standard vacuum cleaner can damage electronic components, the author is wrong in their belief that this only applies to desktops and not laptops (and why would that be the case?).
PS air compressors are not a good alternative: they might suffer from internal condensation and emit air that is too moist, that's why it's best to use cans instead.
PPS there are vacuum cleaners specifically designed for electronics. They tend to be pretty expensive. It's OK to use those.
Moist air is fine, wet is not. It even helps to cut down on the static risk. And you should always let it sit for a bit after cleaning before turning it on in case there was moisture build up.
The biggest risk is to reach into the guts and zap a component, that's a much higher chance of incidence than any effect from the air itself, after all, the fan also sucks air through all day long and usually is not grounded.
Make sure you always reach for the frame first before touching anything else in the guts of a computer.
PS air compressors are not a good alternative: they might suffer from internal condensation and emit air that is too moist, that's why it's best to use cans instead.
PPS there are vacuum cleaners specifically designed for electronics. They tend to be pretty expensive. It's OK to use those.