• By mid‑August 2023, independent replications had already concluded that LK‑99 itself is not a room‑temperature superconductor but a highly resistive insulator/semiconductor, and subsequent detailed studies up to 2024–2025 have reinforced this view rather than uncovering a viable superconducting phase in the original material. (en.wikipedia.org)

• Follow‑on work has focused heavily on LK‑99 and closely related lead‑apatite variants (Cu/S co‑doping, PCPOSOS, etc.). These studies report phenomena such as strange‑metal behavior and possible diamagnetism in sulfur–copper co‑doped lead apatite, but even the more optimistic papers only describe a "clear pathway" toward superconductivity, not a robust, widely accepted superconducting state in a new material family derived from LK‑99. (arxiv.org)

• A 2024 review titled "Reflecting on the LK‑99 fervour: insights and future prospects" surveys the post‑2023 literature and explicitly concludes that LK‑99 has not demonstrated the anticipated ambient‑condition superconductivity; it treats doped apatites mainly as a speculative future avenue rather than reporting any concrete new, practically superior superconductors that have already emerged from the LK‑99 episode. (pubmed.ncbi.nlm.nih.gov)

• In parallel, the broader field has indeed seen new superconductors and superconducting states reported since 2023 (e.g., a chiral platinum–iridium–zirconium compound, novel one‑dimensional and 2D moiré superconductors, and a copper‑free high‑temperature nickel‑oxide superconductor around 40 K at ambient pressure). These results extend long‑running graphene/TMD/nickelate research programs and, in their own papers and press material, trace their motivation to earlier cuprate and nickelate work, not to LK‑99 or its simulation models. (phys.org)

• Crucially, there is no documented case in the peer‑reviewed literature where a new, distinct superconducting material (beyond the LK‑99/lead‑apatite family) is both (a) presented as a direct outgrowth of LK‑99–driven simulations or experiments and (b) shown to have properties that are clearly easier to manufacture or superior to the (ultimately false) room‑temperature, ambient‑pressure claims originally made for LK‑99. Reviews of the LK‑99 saga frame its main impact as a cautionary episode and a case study in flat‑band physics, not as the progenitor of a wave of new, better superconductors. (pubmed.ncbi.nlm.nih.gov)

Given that more than two years have passed since the August 2023 LK‑99 claims and no such LK‑99‑spawned, clearly superior superconducting materials have appeared in the literature, Friedberg’s specific prediction about the episode catalyzing new, better superconducting materials within that timeframe has not materialized.