msu2001la

That's not correct. Most, if not all of the Trek Segafredo team was on 1x this year. Women too.
They've been experimenting with 1x for 3-4 years at Roubaix. The bike in my earlier post is from 2019.






Lizzie Deignan won on 1x in 2021:
Lizzie Deignan's winning Paris-Roubaix bike | 1x, tubeless & discs - BikeRadar
"Trek-Segafredo women’s team opted for a 1x setup for Roubaix, pairing a 50-tooth front chainring (fitted with a Quarq power meter) with a 12-speed 10-33t cassette and SRAM’s wireless electronic Red eTap AXS rear derailleur. With the 116k Paris-Roubaix Femmes predominantly played out over flat roads, Deignan had little need for a front derailleur, though the British rider had a K-Edge chain catcher in place to provide some additional security over the harsh cobbles."

Elisa Longo Borgini won on 1x in 2022:
Longo Borghini's race-winning Trek Domane - 'The perfect bike for Paris-Roubaix' | Cyclingnews
"Elisa’s bike was set up as a 1x setup with a Sram Red AXS groupset, sporting a large 52-tooth front chainring, alongside what we expect was a 10-36 rear cassette."