Rubbish. Soldiers from all over the empire were needed to subdue a
handful of Boers. The only difference between Germans and Boers is
numbers. Boers are top-quality fighters. Tough as nails.

True,Boer war a foretaste what was coming as Boers,unlike populations british
colonies,were continrntal Europeans.
But still British managed to subdue Boers without help from US,USSR etc.

Soldiers all over empire were obviously present during both world wars.