Capn Bloggs
Who believes Jeppesen? The ZA CAA diagram clearly shows the Mike apron is over 300m away, down taxilane Mike and then off to the side.
Not going to descend into Jepp vs. Whoever willy-waving irrelevancies, the point of both is the same. The ZA CAA diagram also clearly says Mike is NOT a taxiway either, and by using the term taxilane should alert you to this fact (that it's related to an apron area) as that's how it's described in the Caution re TWY B itself.
Both Jeppesen and the ZA agree with respect to what's pertinent to us pilots taxiing aircraft: that this intersection is one to use Caution when approaching, and do not mistake what lies straight ahead (taxilane M to Apron M or apron M extension, who cares) with TWY B.
And as someone pointed out, the lack of blue taxiway lights along the the apron lane is also a big indicator a taxiway didn't lie straight ahead. So would the fact that the chart depicts that to stay on Bravo it means making the first and only left turn south of India, and that turn is a dogleg (the only one) which is a pavement cue. There is also a Cat2 holding point depicted for 03L point on Bravo just beyond that split and those have illuminated red signs, so also could have quite possibly have been in view at the dogleg.
If one reads the Cautions listed when times/duties aren't a factor, and upon finding one that could absolutely affect you, one would try to sort out other ways you can mitigate the threat and maintain SA when it presents itself. The other cues I listed might be some of those identifiers to confirm position in the big picture. How do you deal with finding your way at an airport when snowpack and/or snowbanks are covering or obscuring almost everything we rely on, and therefore almost every correct intersection or split becomes difficult to identify?
There's plenty of space on the ZA CAA chart to put the caution/note about Mike beside it.
If someone can't look far enough down a chart to see that taxilane M doesn't even lead to the runway in question, but rather to apron M, what makes you think they'll be purusing tiny text at all questionable spots in a scattershot pattern on an airport diagram if they miss a big, shadowed box with a concise list at the top where it's almost un-missable?