I think you can over-analyse such things, esepcially for the average / low hour / low currency PPL.
The "golden rule" of not turning back for an EFATO holds good - engine stops just after takeoff, you need at the forefront of your mind to resist the instinct to return, and just go straight ahead. You have very little time to make a decision, and need max brain power to "fly" the forced landing.
This accident was not one of those, and comes under the heading of more normal emergency without a time critical aspect. Whether you wish to include in a PPL type takeoff brief the "what will I do if I need to return" is up to you - good airmanship, but once when considers one "what if" where do you stop?
In the airline world we have "DODAR" and various other systems for decision making - equivalents are in the PPL syllabus. Maybe, with 20:20 hindsight they were not best employed here, as the AAIB note, but it was an "unusual" circumstance, and the tragic outcome had a few unlucky elements in it
Summary: I think it a mistake to question the "do not turn back" rule using this accident as an example - it was a different scenario... IMHO
NoD