I am relatively new to the forum and will be curious to see what other responses you get, but I'm guessing that he's marking his new territory and/or is still stressed by the move to a new space. My suggestion is to go back to confining him to retrain him and introduce him to the larger area bit by bit, just like you would with a new rabbit..... It's just a temporary situation until he gets used to his new home. If you don't nip it in the bud quickly, though, it could be a longer-lasting problem.....

looks like he is marking his new territory and I do agree with Theresa, try confining him to an area for a bit and slowly allow him to have freedom if he is good with using his box.

New territory, post move stress... I'm with the others he will have to be rerained but once he has settled things should go back till normal. Until them get some hay filled litter trays and put them in his preferred peeing spots. Once he starts to favour one of them then you can gradually remove the others.

I was going to say any drastic change in behaviour, you need to see a vet first. But this is easy-you've just moved.
I'd confine him to one room, a comfortable one where he'll get his usual interaction (Whether thats watching you eat meals, or watching tv with you) and slowly expand his territory. A big change like that, it's totally unsurprising that he's peeing everywhere He just needs some time so in the meantime, cut back his space.