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No, the fact they're launching it in January, leaving Pokémon day AND next November free of its release indicates they have another new Gen being readied for then.
They didn't skip a November release in 5 years at this stage and if they contracted whos to fulfil that Novemer release, while Game Freak themselves fucked about with Legends, odds are they're not going to miss a November launch window intentionally.
Also, just a reminder here children - they already equated the DLC to their past Gen third versions, they're not adding DLC for either BDSP or Legends, no matter how much or how hard you want it to happen Machine doesn't stop, BDSP/Legends' launch dates should have told you that one already.