Can't understand that change!
Callsign should go at end of read back. Put it at the beginning and on a busy frequency this can be potentially confusing for other users monitoring who might be misled into thinking that FISO (or AG/ATC) are making the call rather than the a/c.
As a matter of interest Lufthansa, for reasons best known to themselves, always put call sign at beginning of the read back which is in contravention of ICAO R/T.