In config TAB ---flt Pln , if i enable the options of "randomize SIDS and STARs and randomize Approach types", it means that teh ATC  can change during the fly the initial approx and STAR he give us?

thanks

The User's Guide explains it a clearly as possible:

Randomize SIDs and STARs – This option will provide a little more variety to your flight plans. If the Flight Plan has
multiple SIDs (or STARs) for a connecting waypoint in the flight plan, this option will randomize (mix up) the
selection of the recommended SID or STAR. If there aren’t any connecting waypoints in the flight plan, it will be
ignored. This option will be applied to the selection of procedures using Auto Plan and when ATC is assigning
them.
Randomize Approach Types – This option will provide even more variety to your flight plans. Instead of always
being assigned the most precise approach type – usually an ILS approach – you’ll be randomly assigned the RNAV
or even the VOR approach for your destination airport.
Randomize Vector Approaches – This option will have ATC provide vectors at random, even on approaches where
vectors are not indicated, based on the procedure or rules for the approach.