I was told once that VW's production processes were so sophisticated that you didn't get 1 cm more of wiring than was required to build the vehicle as ordered. On that basis I would say it's unlikely that wiring would be in place for speakers that weren't fitted.
Realistically you may actually get a better response to this sort of query on Briskoda. There is a huge wealth of Skoda knowledge there particularly when it comes to doing mods and updates.
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