Good Lord! How depressing and possibly unnecessarily so.
The hormone he is already on works by stopping the body from producing testosterone. In effect this starves the cancer but it seems in dad's case that hasn't worked as dramatically quickly as might have been hoped so they have added bicalutimide, which disguises any remaining testosterone so that the cancer can't find it. This might work for quite a while or it may only last a few months but when that fails and dad becomes hormone refractory (that means the cancer has learned to survive without testosterone) then other treatments become available like chemo (which is getting some great results in new combinations) enzalutimide, abiraterone, stilboestrol and radium 223. Sometimes after chemo, a treatment that had stopped working becomes effective again!
Perhaps for the next appointment try to go to the hospital rather than local clinic, especially if that was the reason the specialist didn't have dad's records.
If it was my dad I would want to check whether he was actually diagnosed with adenocarcinoma rather than one of the more rare types of prostate cancer ... is it written on his paperwork perhaps?