[Elecraft] K2 with 144Mhz transverter

[S55M]

Please some comments:

I had information that DK8SG measured some HF transcievers  K2 included  with 2m transverter and got this data for K2:

NF 6dB, IP3 -26 dBm and TX noise at least 10dB greater than FT1KMP.

For those who r not familiar with this data I can only say that are bad....but how???
I suppose the transverter was always the same.

Why? How? 

TNX for answers...

S55M-Adi