Forget about whether India will reach $4000k by 2028 or 2030. Talking about India when we discuss Bangladesh's potential forecast is typical immaturity that leads to prattle in PDF. I will generally stray away from it unless the topic itself is explicitly about comparison.
So now about IMF projections and what not, have they not been wrong before? I think it is possible that we have a recession in the immediate future. Remember reading an Indian news opinion piece that said textile industry could experience a lull because of drop in global demand. The article itself was for India, but a global downturn will not leave Bangladesh unscathed. What will happen then? So yes, I do not think that it is 'almost certain' for Bangladesh to reach $4000k by 2026.
Dude, I think your problem is you do not understand BD economy.
It is about as "recession proof" as any economy can be. I take your point about India though that is reliant on services exports that get hit harder when the West falls into recession.
It's major export basket(garments) will keep selling through any global recession which would be mild compared to the Covid-19 induced one in 2020 - that year BD economy grew 3.5% when its biggest exports markets like USA and Germany shrank by around 4% each and UK by 10%!.
Most that is likely to happen is that BD economy may "slow" down from 7-8% growth to 5% for one year max and then back to normal.
Now let us move on from this as this is distracting from the topic on hand.