I dunno, this seems hard to believe for me. A good kicker is always going to be supremely confident in his kicking ability, unless he has an injury, so the distance a kicker feels confident in making is always going to be at the very top end of that kicker's range. The job of a coach certainly requires taking into consideration that input, but only as one data point. I'm sure if BB had polled the offense before fourth down and asked them how confident they were in converting the fourth down, to a man they also would have said they were very confident, feeling good, etc.Sorry to beat a dead horse but my point (again) is that this is the process that happens every game and I know with other teams and I bet with every decently-coached team in the league. The coach will consult with special teams coach (and the kicker either directly or through the special teams coach) what distance the kicker has confidence making.
If the coach doesn't trust the kicker and/or the ST coach, the coach is going to get a new kicker and/or ST coach.
If Harbaugh gets an indication from Justin Tucker and/or the special teams coach that Tucker is good from the 55 yard line, once Harbaugh gets to the 55 yard line, he's going to strategize as if Tucker is going to make that. He's not going to wonder if Tucker took into account conditions or the condition of the field (etc.). And Tucker apparently is always correct.
Input from the special teams coach is a bit different because he will presumably be more realistic about the kicker's abilities. So I do assume that the coaches collectively determined the yardage from which a kick made sense, I just don't think Folk's confidence played a massive role in that decision (obviously if he had told them he definitely couldn't hit from that yardage, his input would have played a bigger role).