He probably didn't see a thread for the SDS 100/200 and just seen the update for the 150 thread. If I hadn't just liked to look at all threads like usual to read, I wouldn't of realized the SDS 100/200 had an update either..
Usually the SDS 100/200 had its own thread or if it wud been listed as update SDS 100/150/200 but I figure the OP of the 150 thread might not realized it was for the 100/200.. so he was just trying be helpful, I get it, and it's appreciated.