[ICOM] Icom 7300 Dither signal question

[John Geiger]

I am trying to figure out exactly what the Dither signal involves for the
7300 when the IP+ is turned on.  Here is what the QST review says about it:

"The IC-7300 has an IP+ feature, which
inserts a dither signal when you activate it.
You could say this is somewhat like adding
a strong signal off frequency, which has the
clever effect of reducing the intermodulation
distortion (IMD) products. The dither
signal is noise and it raises the noise floor a
bit."

To me that sounds like putting a strong signal off of frequency to cause
some blocking and desense of the receiver, which would reduce the
sensitivity (raise the noise floor).

Is my interpretation of this even close to being correct?

73 John AF5CC