It's nothing but a a bit folklore designed to get you to pay more money for less base Trenbolone. When it was originally made briefly by Negma in France, 50mg base Tren was deemed to be the medical dose for humans. The hex ester has such a a high molecular weight, taking up about 34% of the total, that 76.5mg ampoules would yield the 50mg base drug.
The half life is almost identical to Enanthate so you're getting much better value for money buying a 200mg/ml Tren E than a 76.5mg/ml or 100mg/ml "Parabolan", which seems to cost about 25-30% more than Enanthate. In the end, you're paying 5-6 times that of Enanthate for the same thing. It's complete nonsense.