If those numbers are right, the IMD products for 800 and 1800 Hz fall 200Hz below the carrier and at 2.8 kHz. Those frequencies aren't in passband either. For instance, a test of the Yaesu 450D showed the TX passband only going up to 2330Hz. We published pictures of spectrum analyzer plots in the magazine for decades. Readers can look at the pictures and decide for themselves.