if you are going for max muscle gain, are a long distance athlete, lean, or handle carbs very well, then taking Surge during the workout has benefits that are hard to match.
the GH release thing is bullshit. not that it doesn’t happen, rather that the effects like you stated are usually transient and occur when the person has made a change, either diet, supplement, exercise, recovery-wise, or any or all of the above.
this measurable change will diminish as other factors are more important for controlling GH releases.
one of the easiest things to show (scientifically) is that there is a measurable increase or decrease in GH when a change in the aforementioned parameters occurs. however, though the results may be statistically significant and reproducible, they are usually not a large enough deviation to have any significant influence versus baseline levels.
it is the same reason GH releasing supps are BS, just in the opposite direction - release vs. suppression.
i would worry more about proper nutrition and rest/recovery to optimize long term GH levels and ignore short term measurement deviations.
for now, whether or not Surge is used during a workout should depend on the intensity and goals, not an irrelevant study that is tantamount to accounting fraud.