Sounds... unlikely
So she announced a scenario she experienced as a hook to go off about medical device software being open.
Problem is it doesn't add up. Manufacturer representatives aren't the only ones who can pull the device data, there's plenty of others who could including her cardiologist. Or anyone else in the same profession with the interface kit. It's routine. There's even kits for patients to pull data themselves for home monitoring & diagnostics.
The problem comes from travelling well outside the market where that device was sold and that's not solved by open source, it's an interface standards issue between markets. And even where standards exist open sourcing the core runtime isn't going to have been the solution to getting an EU cardiologist to pull data from a US device if the standards aren't aligned and no one local had the right kit. Same issue exists for all sorts of kit.
And open sourcing certainly isn't going to be a panacea for any issues that exist, there have been some horrific security issues with widely used well scrutinised open software. At least the medical device has had to meet the appropriate development & certification standards so even if not perfect it's still not going to suddenly be much better because you've let a crowd of randoms browse a load of esoteric high reliability embedded code.
Of course the solution that appeals to a lawyer doesn't necessarily have to rely much on facts or reality...