do we have proof it's using pump jet propulsion?
For 09IIIB, I think it is reasonable to say (based on satellite pictures and the various possibly credible models) that they most likely do have a pumpjet, or at minimum a shrouded propeller.
they are not already built. if they are already built, they will be all doing sea trials. I still operate under the assumption that initial batch is 8 & all 8 will be launched by 2025.
It may make sense for them to wait a little bit before building next batch depending on
1) whether they want to just go directly to building only 095
2) Do they find anything during sea trials testing of 1st 093B that will lead them to changing something.
Sunnymaxi as always is using superlatives, but saying that six are "already built" is not unreasonable if he is referring to six having been launched.
"Built" to mean "launched" is not irregular use of jargon, and means they are in fitting out, sea trials or in service. Aka they are "in the water".
What is more up for debate is how many 09IIIBs have actually been launched, and our satellite imagery evidence is not as consistent as we would like.
However, saying "it is possible up to six 09IIIBs have been built and are in the water" would be rather reasonable at this stage