fwiw, I think you are right to say that we shouldn't let speculations shape our perception of this incident since it's hard to gauge the credibility. However one must not forget that fatalities from heat stroke incidents as of the past decade are quite rare as there are multiple safety guidelines and protection protocols that prevents these incidents from happening. From yourself, to your buddy and lastly the commanders that oversee such tasks. Hence it is obvious that somewhere alone the line, someone screwed up badly.
From those who have been through NS, we will know a few screwed up commanders who always like to tekan their man. No matter the consequences. Therefore, when that whistle blowing post appeared, it gained traction easily as it was something really relatable(at least to those who served NS)
Now looking back, whether the author of the post may have felt outraged about this fiasco and want to claim Justice for his mate or has some beef with those names mentioned, we'll never know. But the fact that this incident has happened despite it's rarity should remain a cause for concern.