@Gautam
I think you are right and I got it wrong
I followed up with the air water missile thing , and later realised that the yellow model on the left is not that.
It is most probably what you claimed could be in the first place , a model of a new SSBN
If one takes the front portion of model as the front portion of a SSBN , then the slant appendages are the fore fins. While the hump on the model is the section containing the SLBM silos . While the extended portion before the hump is the conning tower aka mast .
Maybe this model is for hydrodynamic tests.
The fore fins remind me of the Royal Navy Vanguard class :

I see some Russian design influence, for obvious reasons. The hump is almost a bit too high. I do hope they are taking "inspiration" from the newer Russian subs like the Borei-class with its blended hump than the older subs.





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