Seller claiming this is Ultrametra Di2 group, says Deore XT? I am not knowledgable, is this electronic shifting?

Its an older Di2 mullet. This was super popular before GRX game out, and still was for awhile after.

He’s got Ultegra Di2 road shifters up front, and then a MTB XT Di2 rear derailleur in back. The reason for doing this is because you could not run a big rear cassette in the Shimano road ecosystem back then.

This is a dope setup. I ran this on a gravel bike for years before concerting to a SRAM AXS system.

I have no idea what “Ultrametra” is. I’m assuming its a typo and should be Ultegra. XT is the MTB equivalent to Ultegra.