Statement 1 : ${\mathrm{NF}}_3$ has little tendency to act as a donor molecule.

Statement 2 : The highly electronegative F atoms attract electrons and these moments partly cancel the moment from the lone pair.

Bond dipoles of $\mathrm{N}-\mathrm{F}$ bonds are counter balanced to some extent by the dipole moment of lone pair of electron acting in opposite direction. This reduces both the dipole moment and its donor powers.