There are a number a large public aquariums who have used the sw product to get tanks of up to 1,000,000 gallons cycled fast. So ask yourself, would you fill a million gallon sw tank with inhabitants if you had not thoroughly investigated whether the cycling product worked or not? Would you even have bought it if you did not have adequate evidence that it worked?
That defeats your own usual argument because Seachem Stability is also used by large public aquaria, if their publicity is to be believed, and that contains nitrosomonas and nitrobacter, along with various heterotrophs. No mention of nitrosospira and nitrospira.
So you may have to rethink your logic...I have my own suspicions as to what's really going on.
it's called a fish in cycle. Such a large area of water...does it really need cycle aids??