Okay.
Whether you read then flash the modified data through OBD2 port, or remove ECU and do it on the bench, or de-solder the eprom (probably a PLCC type chip) or BDM - the remap wont be any different.
Removing the chip and putting it into a programmer to read the data is what you do when your remapping tool(s) cannot communicate with a modern car. Chip removal is reserved for the older (pre 1996) cars when you had to remove the chip because there was no OBD2 protocol.
It doesn't matter if one person had their chip de-soldered, but ask him what remapping equipment he has. Chances are his tool isn't new enough, and therefore doesn't cover the 1.9MJet
Alientech Kess V2 (latest update version 1.84) should cover it
CMD must cover it
AMT Cartech MPPS (now version 16) does it 100% through OBD
Dimsport Genius II should
Alientech Powergate II should have read/write for it as well
Byteshooter (i'm not sure)
Optican Dual II (and Hybrid) probably do it, they cover a lot of EDC16 tech
Galletto I'm sure does it as well
Those are a few tools - industry tools for tuning cars (not copy crap off ebay). As long as the 'tuner' has 2-3 tools to hand he should be able to cover most modern cars through the diagnostic port.
I wrote a Fiat 1.9 MJET file last week for a member on here last Sunday and that read the file, and flashed the modified version without problems.