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Sounds reasonable, wouldn’t be surprised if the real cost was even lower once bribes and corruption are removed from cost. With that said what did they get for 65 million, not trying to be confrontational or disputing your facts, but a 76mm gun, a few machine guns and can launch missiles, and was sunk by a few USVs.
Perhaps more of indication of where current naval doctrine is read battleship vs carrier

blitz128: "what did they get for 65 million, not trying to be confrontational or disputing your facts, but a 76mm gun, a few machine guns and can launch missiles, and was sunk by a few USVs."

I'm pretty sure there are a lot of really smart people -- here, in Russia and elsewhere -- studying questions like that very carefully.

By my count Sergey Kotov had a 76 mm naval gun, two heavy machine guns, plus two automatic grenade launchers.
Why was that not enough to fend off Ukraine's kamikaze drone boats?
Here's a guess: maybe Russian radar couldn't see the little Ukie boats in the dark?

blitz128: "Perhaps more of indication of where current naval doctrine is read battleship vs carrier"

Even the carriers themselves were always vulnerable to submarines, plus land-based aircraft and artillery, which is why they always wanted to stay as far out to sea as possible, and why they need constant escorts.

So, turns out that neither the US nor UK use Corvette-type ships in the 1,800 ton range, but who does are the Germans, their Braunschweig-class corvette, a nice looking boat.

Notice that it has two RAMS, two heavy machine guns and lots and lots of radar plus other sensors.
And they cost around $400 million to build, which is comparable to our own Little Crappy Ships, and a lot more than the alleged $65 million for Sergey Kotov.