According to Apple, “Under certain conditions, magnets and electromagnetic fields might interfere with medical devices. For example, implanted pacemakers and defibrillators might contain sensors that respond to magnets and radios when in close contact.” So far based on what we can see, it pretty much covers all of Apple’s products, even Mac computers like the iMac and the Pro Display XDR.
This isn’t to say that these devices are dangerous, but rather Apple is cautioning that since they do contain magnets, there is a chance of interference. The company advises, “To avoid any potential interactions with these types of medical devices, keep your Apple product a safe distance away from your medical device (more than 6 inches / 15 cm apart or more than 12 inches / 30 cm apart if wirelessly charging).”
To be fair, the FDA advisory had stated that the interference was considered to be low risk, but then again, for a device like a pacemaker that controls your heart, it’s not really something you’d want to play around with anyway.