It seems that way - I read this [1] which does a high level comparison of the technologies. It does seem like BPG is patent encumbered by the underlying H265 algorithms (aka HEVC) [2]

[1] https://www.zyxtech.org/2019/06/13/what-is-heic-heif-plus-a-...

[2] https://en.wikipedia.org/wiki/High_Efficiency_Video_Coding