Yes this seems to be the case, basically when I use the driving line, and see a red line, to me that doesn't mean break that very second, but break a second later,
Also the breaking line isn't car specific (which I think it should be because some cars slow down and stop faster then other cars, never mind factoring improved suspension and brakes via tuning which improves breaking even further)
To those that master a track generally it's not needed, but it's a useful tool if you just want to get a quick guideline of best path to take through the course and optimal apex through each turn, but it's pointless if it wants me to stop sooner then I should.
But when I turn it off I get so nervous :x