It was not classed as undetectable, at least not expressly. He got that result from a lab, went to see doctor and the doctor apparently said that is ok, get another PSA test in 6 weeks. When that was 0.17 (August) the doctor apparently just said he needed radiation and gave him the apt for 30 September to see that department.
Since then he went to his urologist, i think hoping his PSA might have decreased and thus negate need for treatment. Did a new test there last week and picked up the result today, where this "delay" was mentioned. He did not see the urologist though.
I guess there was no real delay because after the 0.1, they tested again pretty quickly, which sounds like it makes sense.
The urologist has written bcr as a diagnosis in the letter, but it does seem like it just was never gone.
Another urologist I spoke to privately had thought he would probably be offered adjuvant radiation right away given his positive margin, so maybe his urologist had a similar view. However, i think he sees oncologists at the hospital. I will be able to join him for the next apt.