*Lots* of "feeatures". Not much on "benefits"
So "Fast spectrum" IE no moderator like water, heavy water or graphite.
That means the neutrons slam into the RPV walls with 10-100x the energy they do with thermal spectrum reactors ( which the vast majority of reactors that have been built, including the MSR and pebble types are)
"Sodium cooling" which the US, UK and France have experience of needs 3 loops between the sodium and the steam generator because radiactive sodium is a hard (19MeV+) Gamma ray emitter, and reacts violently with water. The slightest leak will admit air which will form sodium oxide, which is a highly effective abrasive, clogging valves, wearing away pipe walls etc.
Nuclear fuel prices are normally proportional to the enrichment level unless you've got a country with a load of bomb grade uranium they want to blend down.
Once that's gone the price for new fuel, starting from natural U at 0.7% U235,stripping about 0.4% of that out will need about 45-50Kg per Kg of new fuel (law of diminishing returns, stripping it down to 0% U235 is almost always prohibitively expensive, even for the US DoE), along with an enrichment site that can handle those levels (most are only safe up to 5%. Above that the whole layout of their plant has to be re-designed for criticality safety). Iran could handle it, but they may be going out of business soon.
Otherwise most of this design sounds kind of stupid and expensive. This corner of the nuclear power reactor solution space has been explored before and there's a good reason work on it ended.
Those reasons have not changed.
Iran could probably handle it.
OTOH the molten salt thermal storage loop is a good idea.
In the UK it could deliver the scale of and dispatchability that would upend the UK gas and electricity markets and end the UK's having the highest electricity prices in 28 countries, including all of the G7.
One day someone will sit down and answer the question "How do you build a nuclear power reactor for $4/W so it competes head on with fossil fuel stations and generates steam at their levels of efficiency (IE 540-600c, this thing is supposed to manage 350c. That's high by PWR standards but p**spoor by gas cooled reactor standards), allows on load refuelling, fissioning of Trans Uranic elements (Pu is a TRU but the others as well) and delivers a complete nuclear power solution inside the grounds of the NPP?
Today is not that day and this design won't get anywhere near that price.