What made you think that there will be order for only 10-16 missiles? Of course there will be more order as BN plans to operate more new LPC, corvettes and frigates with western subsystem in future. Specially this tender indicates that BN's will arm it's six new frigates with a new AShM.
As the article and
@Michael Corleone mentioned TESEO launcher is too bulky and BN wouldn't issue tender if it wanted Otomat which is already in service. Though i doubt we will get Otomat Mk 2-E as exporting missile exceeding 300 km range is restricted. Don't understand why Defseca mentioned Block E in the artcile.
Also Otomat maybe not the only option MBDA can offer as it has Exocet and Marte in it's catalogue. Anyway we already operate three types of AShM so i don't think there's any need to worry about operating cost.
I feel like Turkey might be the winner cause BN let Turkey to contest in at least four area (AShM, 30mm gun, 12.7mm gun and EW system) and if we exclude Otomat then ATMACA beat SSM-700 in range (ATMACA also beats Otomat Block IV). The missile is new and has more room to mature. Also BD-Turkey relation is currently very good and we are buying some new military weapons from Turkey.
https://defence.pk/pdf/threads/bangladesh-navy-will-build-two-new-asuw-lpc-locally.643261/