It turns out the mechanism of action is different for the single burner plug-ins made in Asia (half-bridge resonant converter) and the full multi-burner stovetop units sold in Europe (quasi-resonant boost converter). I was testing the former, but it looks like yeka has the latter. Some also have a “Boost Mode” that does some whacky shit that may create HF harmonics that have enough power to fry an LED.
All the evidence I’ve seen so far indicates that the LF RFID implants are not at risk, but the LF LEDs might be. If you notice your LED implant light up while near an induction cooktop, move away. It takes more than a few seconds to burn one out, so it won’t happen by surprise. It’s tough to do testing in this area because there are such a myriad of different induction cooktop designs.
Interesting document on induction burner designs: