re: PLAN Type 071 LPD & its Landing Craft
Mysterre, here's why people give credence to the 28000t displacement:
1) The PLA almost never officially release parameters of their weapons systems, so words from PLA officers are as good as it gets and they're almost always accurate. If a PLAN officer said it was 28000t, that automatically becomes by far the most accurate estimate. That estimate WILL be used by everyone who seriously follows the PLA as the starting point for their own analysis.
2) As for our own analyses, we're all eyeballing it, we're all estimating. None of us have presented our own analyses as the truth, but merely as an explanation of how the 28000t figure may be true. Since as mentioned above, the words from PLA officers is as close to being an accurate official release as possible, then as long as the figure given is reasonable, then it'll be accepted. You're like the people who said the first grainy photos of the J-20 are mock-ups or whatnot. No, those grainy photos themselves don't mean much, just like our own deductions based on e.g. engine power vs. speed vs. size don't mean much, but when it's corroborated by "big shrimps" on Chinese boards, or "rumors of rumors" if you prefer, then it'll be accepted as truth until proven otherwise.
Like it or not, past experiences have proven that it's the most accurate way of analyzing the PLA. You're doing yourself a huge disservice if you dismisss those "rumors of rumors" about the PLA as nothing more than, well, rumors of rumors.