Missing NEST operators in SNAP

I see that SNAP does not have some comand line operators, which NEST used to have. See the command line reference chapter in the NEST manual ( https://earth.esa.int/documents/507513/1077939/nest+user+manual+5.1 ) like Terrain-Correction.

The list in the SNAP help function ( The SNAP Graph Processing Tool (gpt ) ) is much shorter. Are these missing operators obsolete or will they be implemented later?

[EDIT: I just see that these operators are mentioned when typing gpt at command line, but are not listed in the snap help function. The command line gives out the NEST version of gpt help]