What kind of maps were you using?
All I know is the one time I was there, I came in on martinez canyon road from the west, but went down to the ovens from the east (down the hill), and at the bottom of the hill, if I recall, there were damaged, old looking posted signs and fencing. I thought these were from some point in the past, as there was a steady stream of SxS's/Atvs making the trip. When I left, I continued the "loop" back up to martinez canyon road, leaving to the west, and crossing some of the same fencing/signage.
Shortly after, there were PSAs on facebook about them being private property, supposedly at the request of the owner/caretaker. And then several stories of people be accosted by said person. Whoever it is has been doubling down on keeping people off the property. One of the ovens also collapsed a while back. Of course, that hasn't stopped anyone from going to them...
That said, I know of no one who has had any issues with the surrounding trails like martinez/Rincon/Cochran road.
I will note, however, that the last time I crossed the river to the east, near the old townsite, the gate (simple barbed wire, in this case) that is always open, was closed, and had wires in a way as to discourage opening it (below and above the upper, and lowest strands, respectively). This is probably a mile east of the ovens, and had been done in that previous week. I honestly never even knew there was one there. I rewired the gate properly, went through, and closed it behind me, and headed east.
I ask about this on Facebook pages, but got no real response. I put it off as ranch hands who didn't know better, but I haven't been back since to see.