He wasn't being a d!ck. That post answered your question. What more information do you want?
Yes they work. Anyone who says different is wrong, plain and simple. The turbo heats the air, but only a fixed amount. (given multiple variables) If you decrease the inlet temperature, you decrease the outlet temperature, period.
As far as the intercooler is concerned, even if you had a 100% efficient intercooler, (most air-to-air aren't) you would still only get the temps down to whatever the under hood temps are, which is generally 10-30Â° above ambient.