I don't think anyone in Bangladesh is seriously thinking about attracting FDI from the US. Maybe a little in power generation and energy (even renewable energy) if returns seem attractive, but that is up to very adventurous US investors. Bangladesh has and will have infinite demand for generated power, lots of room for expansion. That has been the traditional area of US investments here. If you forget, there are expat Bangladeshis living in the US too.
Although Bangladesh is a power-surplus country right now, things won't stay like that forever, there are 100 SEZ being built and a quarter of them have gone into production.
The main point of these fluff articles is protecting (and if possible, expanding) the markets for Bangladeshi exports to the US. Mainly Textile products and eventually other things like footwear, ceramics/porcelain, some pharma and eventually electronics in small quantities. So that Bangladeshi workers don't starve.
These articles are published with the aim of helping lobbyists ease US policies for Bangladeshi exports.
A oblique tangential aim is to deflect US thinking from lumping together US policy towards India - applicable towards Bangladesh. That has been the impetus and focus in Bangladesh foreign service circles for at least the last three decades.