Who said it’s set in DSC’s timeframe? A post-TNG series about Picard doesn’t have to reference DSC at all.
By definition it wouldn’t be DSC then, if it made no reference to or connection with DSC. That’d be like a TNG arc that followed the Enterprise-C, and yet never airing Yesterday’s Enterprise to make any of it relevant to the “next generation”.
Also, TNG characters appeared in Enterprise, and look how well that turned out. Granted ENT was good and DSC is awful, so they can’t really do any worse to DSC at this point.
JEDIT: You know what? Sure. I’d love for DSC to be retconned as some ludicrous holonovel Barclay dreamed up.