The 300 m and 1 000 m tables you found are examples. For the actual radius for any aerodrome elevation you need to apply the formulae.
The radius is determined using the formulas in Section 2, Chapter 3, Turn area construction (...) The TAS is based on:
a) altitude: aerodrome elevation + 300 m (1 000 ft); and
b) temperature: ISA + 15°.
First is $R$...