Withdrawn stock is the missing piece. A listing that vanishes may have sold, been paused, switched agent or simply failed to attract an acceptable offer. Counting every disappearance as a completed deal would make the market look faster than it is.
Similarly priced does not mean similarly liquid. Ask agents how they would market each property today and who the likely buyer would be, without relying only on an optimistic valuation. A 220 m² unit may take longer to match with the right buyer or tenant, so include a longer holding or vacancy...
Treating 53 days as bargaining power feels premature, but ignoring it completely could miss a tired seller. Neither approach works without knowing whether the listing was withdrawn, relisted or recently joined by a wave of similar new stock.
An unchanged price may mean the owner is patient...