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By that logic you could simply spin a permanent magnet and generate
an electromagnetic field, but you can't.


If you spin your permanent magnet at frequencies such that the
associated wavelength is a million metres, or thereabouts, then it
would be such a short antenna that there would not be enough radiation
from it to be detectable, (remeber that short antennae are poor radiators,
qv)

But, if you were to spin it at 1000 revs per sec (60,000 revs per minute)
then it would be a different matter.

How about attaching it to the cold side of a jet engine, and analysing
its radiation with your speccy, OM?