The “all 055 production move to JiangNan”part is likely true, not only because there’s a couple of fairly reliable sources had said so, but also ,we have images of 052Ds being in construction in DaLian yard
People can be making speculative educated guesses based on what they are saying and somehow these posts becomes "rumors".
I am not even sure if those modules in Dalian are 052D or 055. At this stage and without sharp pictures, its hard to identify. zh.wiki entry on the 052D now lists four new entries of ships being made in Dalian.
Its possible that the 4 ship batch supposed to be made by Dalian may have been postponed or deterred, as all 052D production are shifted to Dalian. Production of 052D at Jiangnan may have been cancelled for the lack of slots, shifting all production to Dalian. Jiangnan is currently chock full of commercial ship contracts, but its also possible Jiangnan might be allocating resources to build ships like 004 in the future.
If Jiangnan builds 4 Type 055, I do not think it will end there. Remember this is just a batch. It will be followed by another, then another. By putting production into smaller batches, they can make refinements in the next batch. Its possible to cancel a longer term plan on the 055 to make way for an improved 055A.