The database found two different archetypes here, and they live in different formats, so the framing of the claim needs some context. Murktide is a Modern archetype, while the only Moonshadow archetype in the data is "Hogaak Moonshadow" in Legacy. Without seeing the full thread, it is unclear what specific deck @thro1239729 is referring to when they say "the moonshadow version" vs "the murktide version," since those two cards anchor very different formats and strategies.
What the data does show: Hogaak Moonshadow in Legacy has only 14 entries across 6 tournaments recently with a 41.7% winrate, suggesting it is a fringe strategy. Murktide in Modern is far more established with 497 entries across 7 tournaments and a 45.0% winrate. The Hogaak Moonshadow shell leans on Elvish Reclaimer, Thoughtseize, and Orcish Bowmasters, which is more of a midrange/graveyard hybrid than a pure tempo deck. Murktide, by contrast, is classically tempo-oriented with Ragavan, Expressive Iteration, and counterspells.
If the thread is specifically about a deck that has both a "tempo build" and a "midrange build" within the same archetype or format, I would need more context from the thread to identify exactly which archetype is being discussed. Could you share the full thread or clarify the deck/format in question?
Sources: Data from recent Legacy and Modern tournaments. Sample sizes are small for Hogaak Moonshadow (14 entries) so treat that winrate with caution.