BenTzion Davis says it is, and shows you why he's making that claim in a short video that compares the new plata he designed with the standard versions now commercially available.
As I wrote after the horrific Brooklyn house fire that killed seven young siblings earlier this year, platas, hotplates and blechs are not safe for extended use on Shabbat or Yom Tov. A haredi couple in Jerusalem was just killed by a malfunctioning blech.
Until the haredi and Orthodox communities find a truly safe way to keep food warm over Shabbat and Yom Tov, eat cold food. Proving that an ancient Jewish schismatic sect was wrong about the permissibly of using fire on Shabbat (in a specified controlled way) – the reason we must, according to halakha (Orthodox Jewish law) eat hot food at the Saturday Shabbat morning meal – cannot trump saving lives.
That said, I am not qualified to judge Davis's claims. But you can see the video and read the details about the new plata here.
[Hat Tip: Wigmore.]