Hi,
I've checked all the lines mentioned in that press release in the site where all the techincal line docs are published ( https://normativaesercizio.rfi.it/NormativaEsercizio/ ) and none of those lines has ETCS activated or about to be activated. FS press releases are basically ads, and in general FS ads are not to be trusted, not even for your random trip in Italy ;-).

What I can understand is that they probably completed all the works necesary to run on ETCS and so, I guess, all the hardware is there, but they lack of the certification and so it's not active yet. And could be not active for months or even years. I wouldnt be surprised if somewhere they just did preliminary works to activate ETCS in a distant future, so no hardware.

In my opinion it would be better to undo the changes, as even after 2 months after that press release I dont see any document stating the activation in the following months.
I see thet yo are quite new to OSM and you always used iD, but this task would be much faster with JOSM, if you want my advice.

Best regards,
--
AwFi