Question about Netgear Orbi Armor RBK53S Mesh Wi-Fi set

Digitec probably thinks relatively little about item descriptions, which are usually only copied and pasted from the manufacturer. I don't think they read them at all to see if they make sense. Could make work...

Anyone who can operate a computer has a clear advantage here ;)

Yes, I think so too. My conversion gives just under 700 square metres (696.77 m^2).