Bullshit. It might have been a seizure but I bet 'they' caused it,
“[Boyce’s] tragic passing was due to a seizure as a result of an ongoing medical condition, and that condition was epilepsy,”
https://breaking911.com/breaking-disney-star-cameron-boyces-cause-of-death-confirmed-by-los-angeles-coroner/?onesignal_site_push_notification