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DA front mech, so I think this won't work.
re: grx 42T mech - I'm not even sure on the new bike it's working yet. They say it's 1x only but I've used it 2x, just without a GRX front mech (Ultegra) so I wonder if they've disabled it's ability to do 2x if run with a GRX front... that would be pretty fucked.
This is basically the same and also has the advantage of not having GRX on it:
https://winstanleysbikes.co.uk/shimano-deore-xt-rd-m8050-di2-11-speed-rear-derailleur?gclid=Cj0KCQjwiZqhBhCJARIsACHHEH_M0KTtp94CFAaRDaUjIXfs5-UWQDkT2WgkTpufVtjUepRiZqKCR8gaAovsEALw_wcB
Unless you have a road di2 front mech