If you take the time to read the article, check the links. There's some good info there although a good portion isn't exactly "low tech".
True, but for 50 bucks one might be able to defeat 10's of thousands of high tech gear. A better title might have been 'Defeat a billion dollar systems on a shoe string'
When the Opfor has the advantages of well funded technology the solutions may have to rise to the occasion. Some technology is a challeneg to counter. For example, the ability to detect body heat from miles away by Spectre gunships.