As it states in your source > The HEIC holds the HEIF data that is compressed using HEVC by MPEG Wrapping a HEVC file in a container does not automatically vo

As it states in your source > The HEIC holds the HEIF data that is compressed using HEVC by MPEG Wrapping a HEVC file in a container does not automatically void any patents of the contained file. Otherwise, anyone can shove any patent encumbered file format in a ".zip" container (or any container/wrapper) and avoid any patent or licensing issues.