I would be surprised if the actual figure is less than 5.5-6% in a non-covid year when considering other economic indicators, improvement of infrastructure and growth of other developing countries with similar economic conditions. However, accuracy of GDP figures is absolutely vital as the inaccuracies keep building up and multiplying over the years.
8% growth without major natural resource production and despite major infrastructural bottlenecks and lack of industrial sophistication is unheard of. Had BBS not been playing foul, they would release all survey data without hesitation.
BD average growth last decade has been 7% and it started from a very low base in 2009 when AL came into power.
With what was happened in BD the GDP figures are credible.
The same level of growth this decade cannot happen without major export diversification though.