Is this quote about interference from wireless charging coils accurate?
Yes it is a serious challenge to shield pacemakers and shield radiation from Wireless Power Transfer (WPT) coils for small mobiles and large units to charge Electric Vehicles.
WPT is already used in EU with 4kW, 8kW and R&amp;D with 16kW coils @ 100kHz or 200kHz for Wireless power transfer to EV cars and trucks.  Although there are standards for stray radiation at some distance with designs to absorb stray MMF with a ferrite, the risks can increase with failures or non-compliance so fault detection and shutdown must be included in the overall design with stringent qualifications.
Harmonic currents are generated when diodes conduct into low ESR batteries or caps.

But in high-frequency WPT systems the operating frequency must stay within one of the designated, very restrictive industrial, scientific, and medical (ISM) bands (e.g., 6.78 MHz, 13.56 MHz, and 27.12 MHz; FCC 2014).

These higher frequencies might be used for smaller mobiles.