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It isn't consistent with Tyranid lore, in which we know that at the end of the planetary consumption everything goes into the digestion pools to be slurped back into the Hive Ships.

Yes there are organism that are more expensive and slower to produce and thus are far rarer and harder to replace like Hive Tyrants and Bio-titans (or bio-artifacts), and those do somewhat justify army restrictions on the TT and at the tactical level on the lore. But even the Swarmlord isn't truly unique as the Octarius Warzone notes that the Tyranids are able to spawn the Swarmlord all over the galaxy even simultaneously. In fact it seems to be a recurring question if each one of those Swarmlords can even be considered a different individual or just the same individual existing in multiple locations at the same time. A similar statement is made in Devastation of Baal in which a Lictor side character is noted to be on Baal just as it is on a thousand worlds simultaneously.