The magazine goes in to more than that, solar/old tech stuff is included (I would think) because at this stage, disengaging from tech effectively excludes people from society. So I read it as meaning "within the boundaries of remaining included in society, how low tech can we go?" and the conclusion is seemingly "we can host a high traffic site on a battery powered raspberry pi".

The other stuff in the magazine is very low tech indeed: their articles on hot water bottles, pedal power, very early solar power, and agriculture among others are exceptionally interesting and I'd recommend reading them.